Quote:
Originally posted by paynep
[quote cos the bigger 40mm headers alone should give another 3bhp.
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Dream on............some of us have been there already!
[/quote]
There's been a few headers fitted by several folk over the past year, almost all with dyno runs. I'm not aware of a single one that has produced more than 0.5bhp difference on a 674 motor...
Not even the big bore made 3bhp! In all seriousness, I'd recommend going the 583 route as you can be much more competitive without shelling out loads on trying to tune the bugga.
Let me know how you get on with the headers as mine are on their last legs too.
Cheers,
Ali