damo wrote:
how important are these pipes ?

Actually, they are EXTREMELY important. They have different sized jets in them (3 in total) and the wrong parts can (and will... I speak from experience) melt pistons.

HRC do not make parts for a joke.

If you cannot source the HRC parts, at least use stock parts. The higher the engine revs, the more air drawn through the jets. If these jets (or random "open" T-pieces) are too big it will lean the mixture out too much and seize at WOT/high RPM.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

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