It's from the AWE exhaust teaser post. They use a mustang dyno. Everything I've seen from them seems to make sense as far as numbers go. Stock B5 S4 puts down 190 whp. My APR stage 3 A4 put down 224 whp on the same summer day that a friend's T28 A4 put down 225 whp. The numbers and curve seem to agree with the APR numbers. Hopefully their exhaust numbers are coming soon.
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