on the 99 STS. I have corsa exhaust system, and it didnt really sound too much like what the exhaust tones they put on thier websites...but the power gains were def. noticeable.
i had dynomax mufflers, and personally i thought they sucked...too low and it made the noise sound like it was coming from the engine rather than the rear....BLAH!!!
so i get a dynomax hi flow universal 2.5inch cat installed, and lemme tell you...not only does this sucker get louder...but it sounds totally similar to the corsa website tones...i think this is what they did to achieve the sound...the Hi flow i noticed also gave me more power/torque..thats for damn sure...I LOVE IT!!! and no SES code.
my ques. is. will the RSM TB throw a code? and will it fit to the stock airbox's inlet tube???
also i checked out the cadillac fabricators website...looks like they are working on headers for our cars...pretty sweet.
also has anyone tuned a 99 or newer STS at all?
i think id be interested in getting minor tuning..nothing crazy