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And hearing these reviews doesn't mean a lot to me I see people running the header with canned tunes designed for a different header and running rich etc with no logs showing anything and only butt dynos. It isn't exactly scientific but a vague check for flow increase could be done by doing 5x 3rd gear pulls and averaging the mass air flow g/s in excel, then 5x after the header averaged to see flow increase. But this is not very accurate. There are also so many more things that tuning for the actual header could increase such as egt changes allowing for additional timing.
Saying you didn't get what promised off a butt dyno and from the "scientific" tests done so far there is nothing to report yet :P. Hopefully no one takes these as negatives when considering this header. I am sure it will do quite well with some quality time on the dyno.
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