hokiruu wrote: The number of canisters does not determine how loud an exhaust is. Those canisters are in fact muflers, not amplifiers. So your "the more canisters the louder" appoach is not very well based.
I never said they were "amplifiers". And yes, the number and size of the outlet(s) does determine the noise level of an exhaust.
First consider the fact that most of these japanese manufactured exhaust's mufflers have hardly any sort of muffling material in them. Which is why they give such good power gains, and why they contribute to failed emissions testing in states that require it, like mine ( Maryland ).
Besides the design of the muffler, the part that plays a big part of the exhaust note is the design of the outlet.
Ex. a Honda exhaust at a puny 2.25" diamater, with a 3 inch exhaust tip is incredibly loud.
Ex. Roll a peice of paper into a cone and talk into it, the larger the outlet of the cone, the louder the noise. Now if you put 2 paper cones of equal size, and talk into both of them simutaneously at the same strength you did when you had 1 cone, you now have roughly twice the amplification.
It really isn't that hard. I would assume anyone would be able to come to that conclusion themselves.