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anyone ever seen or had one of these exhaust systems? http://www.xs-power.com/audi-exhaust-catbacks.htm

i have the apr software on my otherwise stock 2001 s4. it seems to make a little squeeling or hissing sound under boost and sometimes howls at cruising speed. is this boost leakage? what divertors should i run and how should i address this issue? seems to kinda jerk around sometimes as well

on my 2001 s4 factory bose symphony system it sounds like **** when its at low volume(almost like a blown speaker) then when you speed up it all of sudden kicks louder and sounds great. what the hell?

when you buy the chip, do they just send it to you , you put in and go? does it make a noticable difference with no other mods except a k&n filter? im new to these cars so sorry if its a dumb question.

i have an 01 s4. only has 49000 miles but when i first start driving the car it keeps flashing the esp light and the brakes keep doing something like abs does in the snow. tonight the abs light and the esp light came on and the car was almost disabled for a minute. but after driving nice and...