for the past week or so, I've been searching back in the archives regarding 2.5" collector headers... I am specifically interested in 4-2-1 vs a 4-1. I've seen many tests and comparisons and such... but I haven't really seen much about the Type one racing headers.

Anyone have inputs on how these perform? Most pictures I've seen of this header are from the "front" so I can't even really see how the primaries are lined up to guess which other headers it would perform like.

Any input is appreciated.

thanks,
-S

 

Pm circuitsiyo! he use to have it on his si, its a really nice design and the price is affordable.

 

I'm using the Type One Header with SMSP Cat, Modified Stock B-pipe, and a Spoon N1. I love it. The power difference with the header was quite apparent, and I am very happy with my purchase. It's hard to compare since I put all of the exhaust on at once, and didn't have a before dyno plot.

 

My plans are as follows:
Type One header, 2.5" carsound cat, custom 2.5" mandral piping by KTeller8, and a 2.5" dual loop muffler much like that of mugen and hytech.

This is going on a B18C1 but will have ITR cams and intake...

hopefully this combo will work out ok.