I was thinking the same thing 2 muffs??? whyNot a true dual.......2 into 1, then a catalytic converter, then one pipe into a 38" longintudinal cylindrical muffler, with one curved pipe, about 4 feet long coming out, which goes into ANOTHER muffler, placed width wise from wheel to wheel, with two exhaust pipes (duals) coming out of each end. WHEW!!! tALK ABOUT RESTRICTIVE!!
At a MINIMUM,I think the last muffler needs to go "bye-bye" and a K&N air filter (part number 33-2296 ($46.95) needs to be installed.
With more air available, with less restrictive air flow and a slightly modifed exhaust, I believe one should get an additional 20 - 25 horsepower.
However, the air intake noise would be a bit louder, AND the exhaust note would be louder. I would welcome a healthy exhaust note, but we would not know what it would sound like until we do it................and then if we don't like it, we are stuck with whatever sound come out............