most people do 28rs turbo swaps,b/c there's quite a bit of tuning out for those turboes.but if you want a little bigger and still be on the safe side,a 30r would be plenty.you'll never spool if you get twin gt35r turboes. the 30r will put out a good amount and you'll be very satisfied.i had a chane to erive a twin 30r s4 and holy crap was that thing fast.it would hit full boost around 3300rpms all the wy up to 7000.
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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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