i got a 2006 a4 auto, 2.0 turbo. i got the APR programming on it last weekend, and wow night and day difference. what other easy to do mods are available for these cars?? intake? exhaust? anyone recommend anything?

Carbonio CAI
Exhaust - APR, AWE, NeuSpeed, etc
Test Pipe - Eurocode, APR, etc.

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question about the test pipe. will this work with the chip programming i have? or do i have to get it re-programmed when i install the test pipe. also, anybody know a place in michigan that will install it? i couldnt ever find a place that would take out the cats, when i have my vette.