mk-Zero wrote:
Yeah, they sound good on paper, but in reality the biggest restriction is the intake port and valve, by far. A bare carb may pick up 21 cfm with those stacks (or that could be just the stacks alone, hard to say where that number came from...), but by the time they are on a manifold and a head you would be lucky to pick up a cfm or two. I know Darren has never seen any dyno gains with these type of stacks.
The only thing you may stand to gain with longer or shorter stacks is in the harmonics of the intake, but that doesn't have anything to do with flow numbers you would see on a static flow bench...
I run them because they look cool and at least don't *hurt* performance.
With my setup, short manifolds, etc. Which would you run? Short stacks to ensure clearance?