Si - it's a tough call for 2wd. For "on power" you want the 12mm (IMHO), as Chris said it gives smoothest bottom end. However (and this is a driving style thing), when you then back off, it will run on more into the corner - which is something that would give more of an issue for me, as i don't use much breaks. You can also adjust the timing, just to through another curve ball in!!
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Matthew White
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