[Shane@DBPerformance]

Big ports/runners usually equal more lag. Most of the weld-el manifolds out there have bigger inner diameter runners than the outer diameter of the manifold that I had on my car when it 700whp. I have seen some Honda eBay turbo manifolds lately that have runners that are much bigger than the weld-el manifolds, they look like they were made to support 2000whp, but are normally found on 250whp cars. In general, anything before the turbo or after the turbo that is bigger will give less lag, like bigger downpipe/exhaust and bigger air intake pipe and filter. While anything made bigger in the loop from the turbo back to the turbo, will give more lag, like FMIC, intake manifold, ported head, aftermarket intake manifold, etc(except for displacement). I have seen 1000RPM quicker spool on a car from going from a fancy longer runner topmount turbo manifold top to a non-equal length shorties manifold and topend power wasn't any different.