header internal diameter?
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Scooby Regular
Joined: Feb 2004
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header internal diameter?
Hi, does any one know the internal diameter of the standard classic exhaust manifold/headers primary and up pipe if known.
Also does any one have views on what sort of increase you can have in the internal diameter before you will notice increase in lag/spool up?
Cheers for any info.
Also does any one have views on what sort of increase you can have in the internal diameter before you will notice increase in lag/spool up?
Cheers for any info.
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