High Comp. DP on my 916. I believe these are the ones to go for if you want to cut down on costs and not have to strip crank out.

Same weight as originals and so no need to strip to crank and re-balance, good bhp gain, but only use high octane fuel afterwards, worth having squish's done at the same time and cam timing checked or better still vernier gear to 'dial in cams'.

I went on to fit SP heads as well so cannot say exactly what the gain was in figures but it felt much, much better, foolish for not dynoing but knew heads were to be fitted a few weeks later so dynoed then.

Also as a matter of interest I found the best overall chip was the 062 Senna a couple of bhp down at the very top end compared to 'custom' chip, but a full 8 bhp up in the midrange and not as much noticeable flat spot low down.

So there's my experience for what it is worth.