a4 is slow... s4 is a good choice
i just got a 135 N54 though, TT motor and with just a jb4 tune its A LOT faster than my z with full bolt ons was...
535 , 550, s5, mustang gt, shelby, few year old 550i m sport is a sick car, few year old m5, 4 door e90 m3, subaru WRX STI , mercedes AMG car, etc
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09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)
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