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a few inches ...about a feet...not hard to figure out right? :) It's curve so the length will be more. If it's dyno back to back with the regular downpipe (not gutted precat) vs the split flange and no other condition has been changed(A/F,boost timing etc), I must say it's very impressive. 15% rwhp on a 400+rwhp car is REALLY impressive. That's like 60rwhp just with the split flange! If it's true, I am sold. haven't got chance to re-gap the plug yet. It's still misfire when I boost more than 1.5 kg. Definitely gonna regap them to 0.035 or less and tune again.
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