Are O2 "cheaters" needed?

[O's Fan Rich]

I stopped at a local custom exhaust shop to ask about doing the work on my car. There was another MM there that just got done, has Kooks on it. The check engine light is on.
Should I be planning on the O2 sensors flipping off the check light?

[shakes_26]

They can be easily 'turned off' in any custom tune, and usually are as a matter of fact.

So you go for it you.... you..... you Skankee's hater :)

[Paul T. Casey]

I haven't had any Check Engine Light issues with my Kooks. To my knowledge, most people here haven't either. Maybe they (the O2 sensors) got damaged during the install?

[MarauderMarc]

No check engine light here. The Kooks system has places to mount the other two 02 sensors.