shayne

Just to add to this, I have a full Moriwaki system (only used the headers though) and the mufflers are not the same. The R/H muffler has a restricter welded in the the pipe between the collector and muffler. The L/H muffler does not. Looks like a method to balance the gas flow to me, just like the standard collector, as Jamie suggests.

Hawkrider

Sure, but balance the flow it does not. Start your bike on a cold morning and see which side the white exhaust (vapor) comes out of. Which can heats up more? Left side. That restriction is too big to "even" out the flow.

Bottom line: If you can't leave **** alone like me then take it out. It doesn't hurt anything and certainly can't make anything worse. If you sleep well at night knowing that Honda put it there (intentionally or not) then leave it the f%*k alone.

shayne

You mean the Moriwaki set-up here Greg?

I can't test it, as I did not use those mufflers (they were damaged). I used Staintunes.

So if the restrictor they built into the right hand muffler is not to balance gas flow, then what else can it be for? I can't think of another possibility. It is in the link pipe that is welded to the muffler. Nicely made too, so they must have had a good reason to do it.

JamieDaugherty

Exactly!!! Take that same morning and crack the throttle and hold the rpm at 2500-3000. What happens then? The flow comes out of both pipes evenly! This restrictor in fact does balance out the flow between the two pipes.

gboezio

This may be a sound issue, gases need to get out of there, to me a single low restriction exhaust would be enough, the the strong pulses of a 500cc cylinder exhausting is hard to slow down in a single exhaust, unless you make it huge, or spread it in two. I see no other reasons to restrict flow. The bundle of snakes is already doing a good job restriction wise

supermatt996

just to get my 2 cents in my buddy has a 2008 Yamaha FZ6 and his aftermarket also has a obstruction on the right side can to even the flow

Hawkrider

So please explain why the left pipe is always hotter than the right one then, even after running above idle.

Nope, I was referring to the stock system.

killer5280

I don't have any answers, but I, like Greg, have noticed that the right pipe always runs cooler.

JamieDaugherty

Mine are not different temperatures, at least not that I can tell. They are both hot enough to burn your skin so it's tough to get a "feel" for any difference.

Circuit_Burner

It was designed that way for smugglers ...

nath981

is there any difference performance or otherwise? If not, is the restriction there to primarily even out the flow? If it is there to merely even out the flow, then you have to ask yourself, do you really care that exhaust gases exit evenly? If you do, then leave the restriciton there. If you don't care about the symetry, then cut the SB out.