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Hi rev, our experience has been that around 420 bhp is 100% on an RB25DET AFM with an optimised air fuel ratio. So all things being equal, 82% would be 340 bhp which is roughly 90 bhp more than standard.

Only difficulty with doing this is the air fuel ratio may not be optimised (eg; too rich) and you may be achieving less horsepower than the airflow would be able to support if the a/f ratio was optimised.

We get about 25 bhp from cat back exhaust, dump and free flowing cat adds another 15 bhp. Boost, usually 0.2 bar equals 30 bhp. Pod or panel airfilter adds about 8 bhp.

If I remember rightly, with your mods you could be looking at

250 + 25 +15 +30 +8 = 328 bhp.

So I would guess that maybe the a/f ratios are about 5% too rich (say, 11.4 instead of 12.0). All things being equal of course.

Hope that helps

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