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I didn't see the 12-16 above; only the 12. I believe it is something on the order of 15-20. I know that a heavy flywheel causes the drivetrain to rev slower and therefore lowers the bhp.

The drivetrain loss is hard to estimate except if you have the factory numbers (always on an engine dyno = flywheel hp) AND the wheel dyno numbers.

I have seen an SVT wheel-dynoed at 155 hp (E0 - 195 hp at manufacture; this one had ~30k miles). I have always based my drivetrain assumption for our cars on that number. To estimate the loss, take your stock hp manufcturer rating, divide it by the wheel dyno number of a STOCK car like yours, then subtract 100%. You probably already know this.

Also - I am a little skeptical of the tru-dual exhausts on our cars because I have seen a drop in numbers over quasi-duals of similar diamter. Our cars need a limited amount of backpressure to get moving.

I still like the car - just that the little g-force meters aren't comparable to wheel dynos or engine dynos. I think people just throw all hp readings into a pile and assume they are all comparable.