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Thread: Exhaust Mods in the PRK?

  1. #1
    Join Date
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    Exhaust Mods in the PRK?

    I have made a pretty good start on my mods on my 6 month old MM, thanks mostly to all the info I got on this forum: 4:10 gears, stud&girdle kit, MMX driveshaft & loop, 180 stat and cooler MC plugs, megs delete tips, rear sway bar, control arms, Steeda UD pullies, SCT 9100 tune from Dennis, and now a JLT RAI waiting to be installed. (Not counting all the bling stuff that's just for fun!)

    I spoke with Dennis today about getting the Cobra exhaust installed, as that is something I have always wanted to do, and learned to my disappointment that neither it OR the kooks system is legal in CA! I knew about the S/C cars being a problem here because my brother-in-law has an S/C'd Cobra with a ton of work into it that he can't drive any longer. But I didn't know about this, and it's a disappointment because I was counting on at least another 25 HP out of the mod.

    For those of you in this damned state: are their ANY exhaust mods I can make to the system that will increase HP while still keeping the 4 catalytic converters in place? Would upgrading the mufflers help? Dumb question: would it be worth it to replace all the 2" pipe under there with 2.5" stuff, but keep everything else the same?

    Thanks as always for your help and info!

    Regards,

    Norm

  2. #2
    Join Date
    Dec 2002
    Location
    Los Angeles - California
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    1,049
    Quote Originally Posted by Svashtar
    I have made a pretty good start on my mods on my 6 month old MM, thanks mostly to all the info I got on this forum: 4:10 gears, stud&girdle kit, MMX driveshaft & loop, 180 stat and cooler MC plugs, megs delete tips, rear sway bar, control arms, Steeda UD pullies, SCT 9100 tune from Dennis, and now a JLT RAI waiting to be installed. (Not counting all the bling stuff that's just for fun!)

    I spoke with Dennis today about getting the Cobra exhaust installed, as that is something I have always wanted to do, and learned to my disappointment that neither it OR the kooks system is legal in CA! I knew about the S/C cars being a problem here because my brother-in-law has an S/C'd Cobra with a ton of work into it that he can't drive any longer. But I didn't know about this, and it's a disappointment because I was counting on at least another 25 HP out of the mod.

    For those of you in this damned state: are their ANY exhaust mods I can make to the system that will increase HP while still keeping the 4 catalytic converters in place? Would upgrading the mufflers help? Dumb question: would it be worth it to replace all the 2" pipe under there with 2.5" stuff, but keep everything else the same?

    Thanks as always for your help and info!

    Regards,

    Norm
    I have same mods as you and researched the exhaust.

    I decided to keep factory cats then i did 2.5 cat back with magnaflow x-pipe and flowmaster mufflers.

    I think i picked up a few HP, maybe 12 HP?

    West Coast Marauders are meeting on Feb 5th at LACR Los Angeles County Raceway for 1/4 mile times. FYI


    2004 BLACK MERCURY MARAUDER
    SCT
    JLT Cold Air Induction
    PHP Intake Spacer
    Cobra Ported Manifolds
    Flowmaster 50's
    Magnaflow X-Pipe
    Stallion TC
    4:10's
    Steeda Underdrive Pulleys
    Rear sway bar



    1969 GREEN MACH I MUSTANG GT
    351 Windsor
    Shelby Cam
    Shelby Tri-Y headers
    Ported and polished heads
    10.5:1 Domed pistons/rods
    Balanced and blue-printed
    Offenhauser Intake
    NOS plummed under intake (8 fuel injectors, 8 NOS injectors)
    Art Carr TC
    Tranny shift kit
    Dual ignition with MSD
    3:90 Posi rear end
    Bought car when I was 16 and still have it

  3. #3
    Join Date
    Sep 2002
    Location
    Florida
    Posts
    4,207
    Exhaust has been my most power adding mod, your local inspection actually look for 4 cats, or just simply put probe in tailpipe and take a reading ???
    Smokie
    12.79 @ 107 mph.
    60' 1.851 Street tires & Stock wheels.
    TIMESLIPS
    Performance Mods: Base Trilogy Kit, Exhaust, PHP Airbox.
    Visit my Garage
    Florida "The Supercharged State"


  4. #4
    Join Date
    Dec 2002
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    Quote Originally Posted by Smokie
    Exhaust has been my most power adding mod, your local inspection actually look for 4 cats, or just simply put probe in tailpipe and take a reading ???
    In California they do a physical inspection and a reading via sensors/computer into exhaust system.


    2004 BLACK MERCURY MARAUDER
    SCT
    JLT Cold Air Induction
    PHP Intake Spacer
    Cobra Ported Manifolds
    Flowmaster 50's
    Magnaflow X-Pipe
    Stallion TC
    4:10's
    Steeda Underdrive Pulleys
    Rear sway bar



    1969 GREEN MACH I MUSTANG GT
    351 Windsor
    Shelby Cam
    Shelby Tri-Y headers
    Ported and polished heads
    10.5:1 Domed pistons/rods
    Balanced and blue-printed
    Offenhauser Intake
    NOS plummed under intake (8 fuel injectors, 8 NOS injectors)
    Art Carr TC
    Tranny shift kit
    Dual ignition with MSD
    3:90 Posi rear end
    Bought car when I was 16 and still have it

  5. #5
    Join Date
    Sep 2002
    Location
    Florida
    Posts
    4,207
    Quote Originally Posted by Directedby
    In California they do a physical inspection and a reading via sensors/computer into exhaust system.
    Florida use to have inspections, they looked under car for obvious holes, but passing was based on whether the probe they put in tailpipe gave a passing reading.... the reading is what determined pass/fail, not how many cats.

    Too bad, the SVO Shorties and all the rest back to the tips gave me a serious torque boost. Plus great sound.
    Smokie
    12.79 @ 107 mph.
    60' 1.851 Street tires & Stock wheels.
    TIMESLIPS
    Performance Mods: Base Trilogy Kit, Exhaust, PHP Airbox.
    Visit my Garage
    Florida "The Supercharged State"


  6. #6
    Join Date
    Aug 2004
    Location
    Kansas City
    Age
    61
    Posts
    1,213
    How often do you get tested in CA.?



    Quote Originally Posted by Svashtar
    I have made a pretty good start on my mods on my 6 month old MM, thanks mostly to all the info I got on this forum: 4:10 gears, stud&girdle kit, MMX driveshaft & loop, 180 stat and cooler MC plugs, megs delete tips, rear sway bar, control arms, Steeda UD pullies, SCT 9100 tune from Dennis, and now a JLT RAI waiting to be installed. (Not counting all the bling stuff that's just for fun!)

    I spoke with Dennis today about getting the Cobra exhaust installed, as that is something I have always wanted to do, and learned to my disappointment that neither it OR the kooks system is legal in CA! I knew about the S/C cars being a problem here because my brother-in-law has an S/C'd Cobra with a ton of work into it that he can't drive any longer. But I didn't know about this, and it's a disappointment because I was counting on at least another 25 HP out of the mod.

    For those of you in this damned state: are their ANY exhaust mods I can make to the system that will increase HP while still keeping the 4 catalytic converters in place? Would upgrading the mufflers help? Dumb question: would it be worth it to replace all the 2" pipe under there with 2.5" stuff, but keep everything else the same?

    Thanks as always for your help and info!

    Regards,

    Norm

  7. #7
    Quote Originally Posted by Smokie
    Florida use to have inspections, they looked under car for obvious holes, but passing was based on whether the probe they put in tailpipe gave a passing reading.... the reading is what determined pass/fail, not how many cats.

    Too bad, the SVO Shorties and all the rest back to the tips gave me a serious torque boost. Plus great sound.

    So getting 4 high flow cats won't work or would it make it worse?

  8. #8
    Join Date
    Dec 2002
    Location
    Los Angeles - California
    Age
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    Posts
    1,049
    Quote Originally Posted by maraudernkc
    How often do you get tested in CA.?
    Was after 4 years, then every 3 years.

    But heard now every 5 years was instated in 2005.


    2004 BLACK MERCURY MARAUDER
    SCT
    JLT Cold Air Induction
    PHP Intake Spacer
    Cobra Ported Manifolds
    Flowmaster 50's
    Magnaflow X-Pipe
    Stallion TC
    4:10's
    Steeda Underdrive Pulleys
    Rear sway bar



    1969 GREEN MACH I MUSTANG GT
    351 Windsor
    Shelby Cam
    Shelby Tri-Y headers
    Ported and polished heads
    10.5:1 Domed pistons/rods
    Balanced and blue-printed
    Offenhauser Intake
    NOS plummed under intake (8 fuel injectors, 8 NOS injectors)
    Art Carr TC
    Tranny shift kit
    Dual ignition with MSD
    3:90 Posi rear end
    Bought car when I was 16 and still have it

  9. #9
    Join Date
    Dec 2002
    Location
    Los Angeles - California
    Age
    59
    Posts
    1,049
    Quote Originally Posted by MarauderMark
    So getting 4 high flow cats won't work or would it make it worse?
    CATS in California are tough as hell and need to be CARB certified. In the viz expection they look and must find the CARB stamp or plaque or see that it is a factory CAT.

    I hear that the Cobra Manifolds will pass viz expection because they have the 'ford' logo stamped on them and they look factory. However, the hi-flow CATS that come with them will not pass the fumes test.


    2004 BLACK MERCURY MARAUDER
    SCT
    JLT Cold Air Induction
    PHP Intake Spacer
    Cobra Ported Manifolds
    Flowmaster 50's
    Magnaflow X-Pipe
    Stallion TC
    4:10's
    Steeda Underdrive Pulleys
    Rear sway bar



    1969 GREEN MACH I MUSTANG GT
    351 Windsor
    Shelby Cam
    Shelby Tri-Y headers
    Ported and polished heads
    10.5:1 Domed pistons/rods
    Balanced and blue-printed
    Offenhauser Intake
    NOS plummed under intake (8 fuel injectors, 8 NOS injectors)
    Art Carr TC
    Tranny shift kit
    Dual ignition with MSD
    3:90 Posi rear end
    Bought car when I was 16 and still have it

  10. #10
    Join Date
    Jul 2004
    Location
    Mexican Gang Infested Salinas, CA
    Age
    68
    Posts
    1,318
    Quote Originally Posted by Directedby
    I have same mods as you and researched the exhaust.

    I decided to keep factory cats then i did 2.5 cat back with magnaflow x-pipe and flowmaster mufflers.

    I think i picked up a few HP, maybe 12 HP?

    West Coast Marauders are meeting on Feb 5th at LACR Los Angeles County Raceway for 1/4 mile times. FYI
    Thanks very much DB. I'll take this to my muffler guy, who is actually very good, and see what he can come up with. I'm not into fearsome sound, and the delete tips sound nice, but a bit throatier would be OK.

    Thanks also for the LACR reference!

    Regards,

    Norm

  11. #11
    Join Date
    May 2003
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    South Fl
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    44
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    1,925
    It might not add as much HP, but if you changed out the manifolds, wouldn't they pass visual inspecton? But the best person to talk to is NAVCHAP.

  12. #12
    Join Date
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    Near Knoxville TN
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    Posts
    10,717
    If I lived in the communist state you do, what I would do is upgrade the mufflers and add a x-pipe along with larger tubing from the OEM flanges behind the cats. That's step 1. Then unbolt the cats and have a set of custom high flow cats welded up to fit the OEM manifolds and flanges to the x-pipe. That's step 2. Then at inspection time I would swap back to the OEM cats for the emissions inspectors and swap back immediately afterward.

    The performance gains would not be as great as with the Cobra manifolds, but it would be much easier to convert the cats back to stock for inspection.
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
    then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
    04 MM Silver, Stock, on standby 85k mi, FPG # 1212 of 3214 or 432 of 997 SB
    01 F150 longbed
    01 F150 shortbed
    00 F150 4x4 stepside
    01 F150 4x4 7700
    68 Stang FB (70 351C 4V, 4 wheel discs, project car)

    Mods listed here (some items not current): FordNut's Mods

  13. #13
    Quote Originally Posted by FordNut
    If I lived in the communist state you do, what I would do is upgrade the mufflers and add a x-pipe along with larger tubing from the OEM flanges behind the cats. That's step 1. Then unbolt the cats and have a set of custom high flow cats welded up to fit the OEM manifolds and flanges to the x-pipe. That's step 2. Then at inspection time I would swap back to the OEM cats for the emissions inspectors and swap back immediately afterward.

    The performance gains would not be as great as with the Cobra manifolds, but it would be much easier to convert the cats back to stock for inspection.

    Damn good answer Sir!!he might be ok i mean the cobras are factory manifolds for a cobra .if they are not polished do ya think they will be able to tell?

  14. #14
    Join Date
    Jan 2003
    Location
    Near Knoxville TN
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    Posts
    10,717
    Quote Originally Posted by MarauderMark
    Damn good answer Sir!!he might be ok i mean the cobras are factory manifolds for a cobra .if they are not polished do ya think they will be able to tell?
    The only problem I see with the Cobra manifolds is the outlets are positioned differently from the MM. So the stock cats wouldn't bolt back up. And the Cobra system doesn't have flanges after the cats located in the same place as the MM. So it's difficult to mix and match, it just about has to be a complete swap if you want to change manifolds.
    Thanks to Darrin @ BC Automotive:
    $1800 and it was worse than when he started!

    Brian (FordNut) FPG # 1458 of 7838
    03 MM 300A (Lotsa mods, 130k mi) was 303rwhp/318rwtq N/A
    then 476/410 D1SC ProCharged on stock block
    then 660/555 D1SC PC on 5.3 wet sleeved Teksid alum big bore stroker
    then 365/369 N/A on 5.3 wet sleeved Teksid alum big bore stroker
    Now 751/617 3.4L Whipple on 5.3 Boss5.0 iron big bore stroker

    03 MM 300B Silver (Mostly stock, originally wife's car, 370k mi) FPG # 7053 of 7838 or 49 of 417 SB
    03 MM 300B Silver, Stock, wife's next one, 136k mi FPG # 7134 of 7838 or 89 of 417 SB
    04 MM Silver, Stock, on standby 85k mi, FPG # 1212 of 3214 or 432 of 997 SB
    01 F150 longbed
    01 F150 shortbed
    00 F150 4x4 stepside
    01 F150 4x4 7700
    68 Stang FB (70 351C 4V, 4 wheel discs, project car)

    Mods listed here (some items not current): FordNut's Mods

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