Need to make a quick decision here. Swapping b16a1 into my crx and would like to know the advantages or disadvantages of 4-1 headers and 4-2-1 headers. Any difference in performance? Let me know what you all think and any other comments you would like to throw in. thanks Pz

 

People will argue that 4-1 is for high end power and that 4-2-1 is for midrange. Depending on the design, it can go either way. One very important thing to consider for our little cars is ground clearance. 4-2-1 usually has the advantage, but there are some 4-1 that give good ground clearance.

Overall, unless you're doing a serious build, I don't think it makes as much difference as some people would like to think.