looking for the best possible low-mid torque with the least restriction on top. i have a dc jdm and top end is good but dont like the low end. im building my B18c1 to 12:1 compression in winter and working towards a auto-x/ road race car, not so much drag. the only ones i could think of was the ib spec JG header w/ 2.5 collector. anyone know about this header or any others for what im lookin for??

 

hytech 4-2-1 or comptech race 4-2-1 if you can afford it...

 

I have the Toda header, and I love the low end torque I felt from mine. Plus my mid-range is now incredible, and not to mention the top end is nice too It is very expensive, but I felt it was worth every penny. Don't know how much you really want to shell out though?

 

does any body here in HT have modified a DC sports 4 2 1 header and put a 2.5 collector, any gain in torque and hp.......

 

Not that I know of, thats a lot of work for a header. I will let you guys know about my Apexi JDM 4-2-1 header in the coming weeks.

 

Low end torque? Take the HKS header. This one has a special design with a 4in1 collector but internal its a 4-2-1.
Also a connection tube between cylinder 2 and 3 for better torque gives a nice 5 cylinder sound.
Very special design!

 

The bisimoto header is a well designed header that makes good power on the street and on the track

 

The price is high for the HKS header, http://www.takakaira.com, and at that price other header makers make proven headers for around the same price. i.e smsp and hytech