Long Tube Header Dyno results & Photo

[taKuto]

Originally Posted by tk-421

I'm interested, although it's not immediately clear to me whether this header is a 4-1 or a 4-2-1 (or even if it really matters now). If someone would enlighten me I would certainly appreciate it.

all four ports just are extended and merge together at one point. So it's a 4-1.
A 4-2-1 involves having a pair of ports merge, and then those merged pipes come together to the one pipe.

sorry i dont remember the correct terms at the moment, but hopefully you get the right idea.

so i guess it needs a complete custom exhaust route if we want to keep a cat and other stuff to pass emissions?