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well first off :12a or 13b .if its a 12a my experience has been road race header then 2 into 1 y ,2 1/2 all the way back. pre silencer i use a borla straight through muffler and the same in the back .make sure the borlas you buy are all stainless steel packing !.if its a 13b i use a road race header ,dual 2 "into a dual 2 in and out borla or magnaflow (if its magna flow you need to cut the muffler open and pack it with course stainless steel wool)and for the rear a dual 2" in to 2 1/2 single out.all the bends need to be manderal and .065 wall stainless or 1/8 wall mild steel.if you like to spend $ you can buy a prima flow muffler for about 450.00 and it will make it quieter than the straight through mufflers.
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