May want to try with traction completely disabled. The car may be pulling power but maybe not. If you're getting no wheel spin at all, maybe not. I know comfort or sport has traction involved earlier than sport + before it pulls power. All off will let even more, at least for me but I have rwd and jb4/intake and that's with the summer tires. With my PSS I don't get as much though, but we're talking about 265 rears vs 225s too.
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