DarZeelon
i was given a 6.5 mvvs and am not sure how old it is,it has a red head on it.i read a thread here about tuned mufflers the header pipe and muffler that i got with it isn't what the tuned specs called for, either someone didn't tune it properly or didn't realize how to.the header is 3 1/2 inches long by what Ive read with an apc prop i should start at 5 3/4 .can i use a silicone tube as an extension to get the header pipe back to 5 3/4?the tuned muffler that came with the engine is about 12 inches long I'm not sure who it is made by there are no markings at all on either the header pipe or muffler