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Well.....not exactly what you are looking for, but I installed a cat-bypass first, then an SW chip. The cat by-pass changed the sound, but not really the performance. But the chip really changed the "drivability". My car used to come on strong at about 4000 rpm, but now it is much more linear, and pulls more strongly from lower in the range.
With regard to chip, Steve Wong at 911Chips has been great. Do a search, I don't think you will find anyone who has actually dealt with him that is unhappy with him. I am very happy with my choice and would recommend him to anyone.
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Tom
88 Targa - Mostly stock except cat bypass, SW Chip.
06 Audi A4 2.0t Quattro
02 Saab 9-3, 06 VW Passat, 06 Chevy Cobalt
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