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2010 Cooper S automatic, N14.
Engine had slipped timing.
I had the head ported/polished while I had it off to check for top end damage.
Only other mods, JCW turbo and JCW downpipe.
The 2014 JCW downpipe has a slightly longer cat compared to the 2010 S downpipe, doubt it made any real difference.
Stock intake, exhaust, intercooler, etc .....
The handwritten figures are guesstimates assuming 20% drivetrain loss for an Auto.
Probably +30 gains at most.
Now to get it tuned, very lean .....
