Exhaust...

[twistedsymphony]

Twister - thanks for the explanation. While it might be all dead-on accurate, it doesn't help us too much, huh? At least we know whay we see apparently contradictory results.

A better understand of things is always helpful

based on what I've heard from people I'm guessing that the headers on the VX are very free-flowing meaning that they're great for a supercharger but not so great for a VX without one...

I forget what they're called they make exhaust bits where you can add or remove plates to control the "back pressure" I'd say that you can put on any muffler/exhaust that you want but if you add one of these plates you can play around with the configuration until you have one that gives you the right amount of restriction for scavenging in your desired RPM range.

start with the least restrictive, check your gas mileage across 2 or 3 tanks, add a plate, check your gas mileage across 2 or 3 tanks, if it improves add another plate and keep doing that until you see the mileage go back down then back off a plate and you'll have your sound and performance too

when doing this be sure to keep tabs on when you use AC or ride with the windows open or with a roof rack on, since all of those can effect your mileage dramatically.

BTW I noticed we're in the same region... are there any New England VX meets? I saw a post from someone in Cape Cod recently too...

[Ldub]

[QUOTE=twistedsymphony;132873]A better understand of things is always helpful
I forget what they're called they make exhaust bits where you can add or remove plates to control the "back pressure" I'd say that you can put on any muffler/exhaust that you want but if you add one of these plates you can play around with the configuration until you have one that gives you the right amount of restriction for scavenging in your desired RPM range.

start with the least restrictive, check your gas mileage across 2 or 3 tanks, add a plate, check your gas mileage across 2 or 3 tanks, if it improves add another plate and keep doing that until you see the mileage go back down then back off a plate and you'll have your sound and performance too

when doing this be sure to keep tabs on when you use AC or ride with the windows open or with a roof rack on, since all of those can effect your mileage dramatically.[QUOTE]

I believe what you're talking about is the Supertrapp silencer system.

They make one that fits the stock 3" exhaust tip, if anyone is interested in experimenting, you can find them at www.summitracing.com

Been there, done that... didn't like the way it looked or sounded.

[twistedsymphony]

yeah that works too... I've never used one but I have a few friends who rage about them.

Alternatively you could also just throw on a restriction plate... unbolt a flange (ideally one right after the cat) and throw the plate between the two exhaust pieces and bolt it back up IIRC they make plates that also double as gaskets for just this purpose.

it will reduce the sound but it shouldn't effect the tone of the exhaust at all.