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get the Z06 Ti's with no cats. with this one mod i went from a 107.5-8 to 109.2.-3 mph in the quarter. the only the other mod i have is a k&n fipk and thats it!!! btw my car is an A4 2.73. i just hope ur state doesn't have emission tests. so overall u'll gain some top end.
Pretty cool. I just went from Corsa Indys to the Ti's and though only on the car one day now, I am very happy. With my setup I needed to tone it down a bit, atleast for my neighbors sake. Not too mention that when I started the car in my garage my poor 11 month old son would shake out of his crib Now I want to get a SD tune to get the most out of my package and go from there.