what i mean is everybody has an opinion on who makes the best exhaust meaning the best sound, the best look, and the most Horse Power.

but what i wanna know is which design is the best for horse power?

is it a 4 to 1
a
4 to 2 to 1
a
4 to 2 to 1 with a H type of cross between the two of the four header pipes
or what?

i am just curious , i have a 4 to 2 to 1 type and figured it was the best design but didnt understand what benifit a 4 to 1 exhaust would have except maybe saving some weight.

 

Traditionally, a 4-1 is best for top end power, while 4-2-1 aims for midrange grunt. The poo-poo HTEV tries to make the exhaust ideal in each rev range and matches well in theory. Unfortuneately, it doesn't transfer the flow of exhaust gasses instantly and makes the delivery not so smooth. Hence everybody deleting them and feeling great about it. The absolute best exhaust for power is specific to a particular rpm range. It's possible to use the proper length and diameter tubing in the exhaust, and match the intake to the same rpm with calculated length/diameters fro the plenum to do cool things with the pressure waves resonating in the systems. With a negative wave bouncing off the exhaust valve as it closes, and a positive one at the intake valve while it's open, over 100% volumetric efficiency can be achieved on a normally aspirated motor. Realistically, you should just get a nice 4-1 and rev the **** out of the bike all the time.

 

vwmaniac: you lost me in the middle there, but i caught up at the last sentence :-)