Them or brenspeed or hypermotive are all good. Price for the axle back is normal. I paid 755 for my borla and then 560 for the kooks I just switched too. I have the borla and a Diablo sport intuner for sale. If ur interested pm me. Haven't posted them up yet on this forum. Jegs.com also has exhaust for these cars.
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2011 GT Premium A6 glass roof.
Dynatech LT's, OR-X, Kooks Axle-back, Circle D 5c, Boss IM, BBK 85mm TB, JLT CAI, BMR LCA's, adj UCA & Panhard,Strange 10 way struts, 331 gears tuned by AED.