Header thread
 

Hey do any of you know the link to the thread thats an article which tells the diff between 4-2-1, 4-1, and goes through different brands of headers and gives like hp gains for each? I cant seem to find it.

4-1 = topend
4-2-1 = lowend...
Horse power gains are differnt on all motors.. and other things that are done to it.. name brands are just that..