Reply to "180's"

racecarmikeMember

It likely depends on many variables like engine size, RPM range, cam...etc. On my 2.7 Lt 4 cylinder race engine that had a usable range to about 8,000 RPM we ended up with a 2.25” merge collector with no power loss at high RPM. BTW, merge collectors work really well. When we went from a 3” regular collector to the 2.25” merge collector we gained significant midrange power. Dynos are great tools but the real important thing is that I could really feel the difference on the track. I doubt that I will ever use headers again that don’t have merge collectors. For our 351CI to 400CI street motors my guess is closer to 2.5” to 2.75” collectors. Burns Stainless could answer the question.

2/12/187:58 PM

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