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Old 09-22-2009, 05:48 PM   #8
AaronGTR's Avatar
AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 40
Posts: 12,234
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
Yeah, with the cat removed and the rear sensor not working the pcm may mess with the fuel and ignition timing because the cat's an emissions control device and the pcm thinks something is wrong with it so... I usually recommend a high flow cat to people looking for an upgrade but you don't even see the most gain from it until you get headers because the stock exhaust manifolds are the most restrictive part.

For your question about the SES light, if t he sim is now working properly then yes the light will turn itself off after several driving cycles without detecting a problem. It will keep the codes stored in the pcm for quite a bit longer but those will eventually disappear too. Or you can go to an auto parts store and borrow their OBD2 scanner and have the codes cleared. Either way.
The few, the proud, the boosted!
13.788 @ 103.73 mph (3/2011) 320 whp and 300 ft/lbs torque. (3/2011)
See it here. the total package.
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