That's going to be a hard thing to do. It'll be tough to compare two different cars, two different dynos. If you're not planning on tuning l'd go with the Stillens otherwise look at AAM or the Nismos if water is a concern. When tuned, there isn't going to be much difference between them.
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'13 Audi RS5 Misano w/mods-The Red Mist
'13 G37 IPL-SOLD
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