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Thread: High Flow cats and mufflers? Suggestions

  1. #1
    Join Date
    Feb 2017
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    Chicago, Illinois
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    318

    High Flow cats and mufflers? Suggestions

    Just looking for a better growl than stock. Mufflers and cats probably. Looking at some flowmaster 44s suggested in other threads. What cats are good, (no trouble codes or other problems.) Thanks, appreciate it all.-Mike

  2. #2
    Join Date
    Jun 2011
    Location
    Northeast OH
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    7,999
    go to youtube and look for marauder exhaust vids..exhaust is a preference.alot of vids will show full exhaust with headers so not a true sound for stock manifolds, piping. Flowmasters 44 can be raspy, crackle pop sounding for some and others like it. Unless your cats are bad, no need to change..can remove the 2nd set and place a straight pipe and it will make it louder..no codes will pop up..hard part is finding a shop to do it as removing a cat is technically illegal..
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  3. #3
    Join Date
    Feb 2017
    Location
    Chicago, Illinois
    Posts
    318
    Lookin at Flowmaster delta 50s or the 44s. Stupid question what is the size of our mufflers in and out.? These
    http://www.flowmastermufflers.com/50-series-delta/
    -Mike

  4. #4
    Join Date
    Jun 2011
    Location
    Northeast OH
    Posts
    7,999
    mostly 2.5, but areas are 2.25..read this
    https://www.mercurymarauder.net/foru...ad.php?t=90530
    2004 SB Ported Trilogy 48
    Has supporting mods and stuff
    Thanks to Marty O for his help in updating this car.

    R.I.P.
    Rex "SC Cheesehead"

  5. #5
    Join Date
    Mar 2009
    Location
    Bergen County, NJ
    Age
    77
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    1,131
    I have the complete Stainless Works, long tube, system on my '04.
    The sound doesn't drown out the stereo.
    The hum doesn't weigh on your nerves on long drives.
    It easily passes state pollution tests.
    And the performance is excellent.

  6. #6
    Join Date
    Oct 2010
    Location
    Michigan
    Posts
    1,911
    can remove the 2nd set and place a straight pipe and it will make it louder..no codes will pop up..hard part is finding a shop to do it as removing a cat is technically illegal..
    ^+1^

    I've found they're more prone to do it if you talk in person then over the phone.

    IMHO, look into the Flowmaster Delta 50's. They pretty much resemble the factory sound, just amplify it. I had them with the rear cat delete at one time and loved it!
    2004 Black Marauder: #2237 Born on 4/1/2004

    Eaton Swapped and a bunch of other goodies!

  7. #7
    Join Date
    Feb 2017
    Location
    Homer Glen,Il
    Posts
    7
    Confirming the advice given above! Just swapped the oem mufflers in my 03 MM for a pair of wicked flow mufflers. Tried first with the rear cats still in , and it was only slightly louder than stock. Not good enough! Removing the rear cats was the ticket! When the car is at idle, you'd think it's stock.Step on the throttle and drool! Deep,low rumble that's heard, but not overwhelming. They are similar to magnaflows. Resonators intact. No CELs.

  8. #8
    Join Date
    Mar 2008
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    Next door to my neighbor
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    20,353
    I've had in order

    1) Deleted resonators
    (Same as before IMO)

    2) Flowmaster delta 50, del. res. (Not much better)

    3) Flowmaster delta 50, del res, delelted rear cats
    (Getting somewhere)

    4) Customized MAC LT's, homemade X pipe, delta 50's, res del, rear cat del.
    (God awful raspy)

    5) same as 4 but changed muffs to Magnaflows (this was my favorite sound)

    6) S.W.s LT's, and complete catted S.W. system to rear but swapped their ugly tips for some 4" Megs. (Best looking but don't care for slip joints, fitment sucked, and it only sounds good at idle or WOT.)

    I have plenty of videos throughout different stages on YouTube under Marauding4life.


    Sent from my iPhone using Tapatalk
    SOLD 12/31/2021

    Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.

  9. #9
    Join Date
    Jan 2006
    Location
    Northern California
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    Quote Originally Posted by jsignorelli View Post
    I have the complete Stainless Works, long tube, system on my '04.
    The sound doesn't drown out the stereo.
    The hum doesn't weigh on your nerves on long drives.
    It easily passes state pollution tests.
    And the performance is excellent.
    Which set - off road or hi-flow cat?
    Last edited by Lowndex; 03-11-2017 at 04:52 PM.

  10. #10
    Join Date
    Jan 2006
    Location
    Northern California
    Posts
    2,373
    Quote Originally Posted by justbob View Post
    I've had in order

    1) Deleted resonators
    (Same as before IMO)

    2) Flowmaster delta 50, del. res. (Not much better)

    3) Flowmaster delta 50, del res, delelted rear cats
    (Getting somewhere)

    4) Customized MAC LT's, homemade X pipe, delta 50's, res del, rear cat del.
    (God awful raspy)

    5) same as 4 but changed muffs to Magnaflows (this was my favorite sound)

    6) S.W.s LT's, and complete catted S.W. system to rear but swapped their ugly tips for some 4" Megs. (Best looking but don't care for slip joints, fitment sucked, and it only sounds good at idle or WOT.)

    I have plenty of videos throughout different stages on YouTube under Marauding4life.


    Sent from my iPhone using Tapatalk
    Awesome, detailed response. Thank you for the effort capturing and posting the videos.

  11. #11
    Join Date
    Jan 2003
    Location
    Near Knoxville TN
    Age
    67
    Posts
    10,717
    Magnaflow cats, Borla long mufflers, stock tips
    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

  12. #12
    Join Date
    Oct 2003
    Location
    Beaufort, SC
    Posts
    7,719
    Magnaflow High Flow Cats......Custom H-Pipe......18" Magnaflow Mufflers.....Stock Tips = Deep "Old Skool" Rumble!!
    No Marauder

  13. #13
    Join Date
    Jul 2015
    Location
    Bronx New York
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    45
    Posts
    437
    I got Kooks headers. Kooks X-Pipe with highflow cats. Borla pro-x mufflers. And custom made 2 1/2 tail pipes. With the factory tips. And it sounds great when you get on it. But super quiet once you let off the throttle. If you have the funds. You will not be mad. At yourself once you invest on a full headers to tail pipe kit with muffler. As for the way I did it. It was a little bit of money. For no one makes a catback for our cars. But only Stainless Steels makes a header too tail pipe kit for the Mercury Marauder. But like $2k plus for there kit. Plus installation. Also either way you go. You need to get a SCT tuner. With a tune. And Marty'o Moe's Shop. Can make it happen. And you will not be disappointed. Good Luck on what you do to your car. For this is a addiction. Once you do one thing. Your are going to want more.

  14. #14
    Join Date
    Jan 2006
    Location
    Northern California
    Posts
    2,373
    What re the best aftermarket hi-flow cats? Articles I have been reading favor

    1. Flowmaster 2230125 223 Series 2.5″ Inlet/Outlet Universal Catalytic Converter

    and

    2. MagnaFlow 94006 Universal Catalytic Converter

    Yes, I know they are not legal in CA; not much is. Silly state.

  15. #15
    Join Date
    Oct 2003
    Location
    Beaufort, SC
    Posts
    7,719
    I have the Magnaflows and they've been on for 200K miles and 180K of that with the blower.....they flow fine as far as I know but the best part is NO EXHAUST STENCH!!
    No Marauder

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