i also know that GIAC makes some really good performance chips!!!!! i'm buying the triptonic, and comp. chip. the triptonic is increasing my shifting about 75%, thats pretty damn good, instead of taking a sec. to shift it's gonna take me .25., but i have not checked on wat they have for the S4, but i'm sure they have even more parts for u'r car b/c i drive a 2.8L V-6 A4
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Its Better To Lead Than To Follow!!!!
1998 Audi A4 2.8l 30valve=SOLD 
mods-2.75in. milltek cat/bac exhaust,power adder short-ram intake,Giac ecu flash(awetunning),5%tint rear half,blacked out halo headlights
2007 WR Blue Subaru Wrx Sti
mods- 3in.catless T/B exhaust,(invidia g200 cat-bac,v2catless D/P),COBB AP tune on 93oct,18x8.5 gunmetal work emotion cr's,blacked out headlights
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