Got just one question, for a NA AP1 with CAI and single exhaust, would a 4-2-1 or 4-1 header gain most power and why?

 

The 4-2-1 header (also known as a tri Y) has better scavenging and helps make more torque. The 4-1 is better flowing on top end with boost.

 

ok thanks, which brands would u recommend if Im on a budget and want some power gain? I heard DC sucks.

 

That's about right. There are several new ones out that are made in China so the cost is way down. New for less than $600. Keep an eye out for Berks with the larger primaries. Also check out Rick's and Megan Racing. Used is another way to get a good deal.

 

Whats the difference between our stock headers and aftermarket? Arent they both 4-2-1?

 

Hi,

Difference is that the stock 4-2-1 is restricted.

I run with Rick's manifold, which is identical to Mugen manifold, complete with a Mugen exhaust system.

This setup help my mid range power quite noticable.

But if you need top end power, go for something like Spoon.

I also remove the cat, and replaced it with a megan de-cat, this helped a lot aswell, and its a cheap mod to start with.

P.S. If your are not upgrading your ECU, like I installed a Mugen N1 Ecu, you need to do a fouler adaptor in the de-cat and still plug in the O2 sensor.

Cheers

Nev