Replacing center resonator???
1999 A4 1.8tq Tip
Supersprint muffler
GIAC ECU and Tip chip
K&N filter
Also I would suggest that you dont mix and match or go with custom stuff. There is a reason that companies come out with complete kits. They are made then tuned. The sound is tuned I mean. But I guess you don't have an option...you should give supersprint a call and ask them for there suggestion.



