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Old 03-13-2018, 03:05 PM   #3
Scooby Newbie
Member#: 408701
Join Date: Dec 2014

header pipe diameter should be as close to your exhaust port size as possible for smooth transition.

however tubing sizes tend to come in 1/16" or 1/8" increments so you might need to get a size up or down...if that's the case some metal-massaging to again smooth that transition is all it takes.

if you want max power, go for equal length, with the longest primaries you can fit, they will help everywhere.

UEL is only for the sound and "medium performance".
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