what brands have 2.25 collector size on their header

 

The jdm exhaust manifold that came w/ my b18c1 is ~2.36" (60mm).

 

I believe DC makes a header that is 2.25 and 2.5 inch.

 

Only DC I know of have the stock 2" size and the jdm 2.5" collector.

USDM itr collector is 2.25 ish I think. Someone verify that.

Doesn't the Weapon R header have 2.25" collector as well? Whether it's inner diameter or outer, I don't know.

 

weapon r headers are on back order but i just ordered the megan 4-1 2.5" collector