Imco thumper exhaust manifolds

[KRAVEN]

Does anyone have info about Imco exhaust manifolds,looking to upgrade my SCORPION>

[oldLenny]

Stainless Marine is also very popular...

http://www.stainlessmarine.com/..

[Hardonzi]

I have the thumpers on my 350 mag.picked up 3mph with that and open exhaust.I bought the Gaffrig slash cut with the internal ss flapper,and it sounds like a 500efi when throttled. biggrin.gif