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Dec 11, 2005 | 09:06 PM

#21

don_w

6th Fastest 05+ 1/4mi Time On TMS

Joined: June 21, 2005

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Quote:

Originally posted by NOLAGT@December 11, 2005, 8:01 PM
Ahh ok. So what is the advantage of going 3"....only needed if you do FI?

Quoted post

It is my understanding that the 1-5/8" primary headers are preferred for NA cars, and the 1-3/4" for FI. The 3" collector is on the SW 1-3/4" headers. I think most 1-3/4" headers have 3" collectors. Some (maybe all) of the 1-5/8" headers have 2-1/2" collectors. But, I could be wrong.