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In your case it doesn't matter. Your main problem is the automatic tranny @450 rwhp. Your main concern should be how to get the transmission to work properly and not fail. To date no one has a rebuild kit to solve this problem.
At 4000rpm's and WOT, both APS and Greddy will immediateley be in full boost. You may want to consider the JWT TT for your car if you want ultimate response and 500-525whp power potential...