Got my exhaust, HFCs and 4.08 gears installed. The power difference is truly amazing - it's like a whole new car now. I've very happy with the results.
As far as the effects on SRM, when downshifting, the revs are about 200 RPMs under what they should be. This doesn't bother me as all I do is release the clutch a little bit slower to make up for it.
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 '12 370Z + Sport | Stillen Gen3 Intakes | Stillen UD Pulley | Motordyne M370 | FI Exhaust | FI HFCs | 4.08 Gears | Uprev tuned
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