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that was track'n'road, if there was a flat spot they could tune out, it would have gone.
now that was a std manifold with no vis, and average exhaust manifolds as it was in a bubble. so results could have been better. but that doesnt mean it would have gained 30-40bhp from it!
depending on what revs these tb's are tuned at id expect to see a few lumps where the cams+tbs come on song.
Drew
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