I have done a lot of work with merge collectors and I can tell you they do work, BUT (there is always a but) if you think you can buy a merge collector off of eBay and pick up a bunch you are going to be disappointed. On my engine I built a set of headers and after seeing the results ordered a new camshaft, made more power with less exhaust duration and the exact same intake lobe. Didn’t go far enough.

So as to not to hijack this tread anymore, let’s just say if you see any carbon in the intake track you can made some power with a merge collector but you’re going to have to let go of some old wives tales (yes, I know that is sexist).

Joe