The 350Z HR and 370Z HR show similar gains on the dyno, with the 370Z obviously being a couple points higher. This is a proven modification, not just by us but by many individuals who have done before and after dynos.
Your butt dyno will approve, the dyno at your local shop will show gains, your wallet will be fatter due to the increase in fuel economy, and your engine will be more responsive all around.
The 20 pages of feedback from Z owners here in this thread back all of these claims.
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