Ben, 1200 rpm lower is a lot more then just a few variables, were are not talking about 200-300, we are talking about almost 10 lbs of less thrust.[:-] Thats a lot, Andy has been getting 6400, almost 800 rpm more then any other Evoltuion 58 owner I know, he is getting this even with a simple bisson wrap around, I know people with an MTW canister and header not getting anywhere near that...[:-]

Anyway, please post your readings with Evolution 58 if you have it. Thanks.