How to get better sound from stock mufflers?

[dr_fosg8]

When you modify the exhaust to flow more air you are altering the fuel/air ratio. More air leaving = more air going in, not as much with just exhaust mods but it does increase some. The only way to compensate for it is to rejet the carbs to add more fuel. These bikes were jetted on the lean side to start with so it dosn't require much change to make them too lean.

Very simple explanation but I hope it helps.

[tkent02]

The only way to compensate for it is to rejet the carbs to add more fuel. These bikes were jetted on the lean side to start with so it dosn't require much change to make them too lean.

This, but the pipe makes less difference than the intake, and usually only at high RPM and power or WOT so likely a little bit bigger main jet is all that is required, maybe shim the needles a tad higher.

[ty998]

Because you are allowing more air to flow. In order to keep the air to fuel ratio the same, when you increase the amount of air you must also increase the amount of fuel. And vice versa. Hence a rejet is required. In your case, it would run too lean and could possible hole a piston. Certainly not run correctly, nor as strong as before the drilling began.

Apparently I am just really dense.
In my case I am putting the same amount of air and fuel into the engine (stock). If the muffler was upgraded to flow more air out why wouldn't it simply do a more effecient job of allowing pressure to exit and that's all? All we are changing here (hypothetically) is the exhaust output. In this scenario I would assume that the engine would perform the same.

Thanks for your patience on this. I would like to understand it.

[ty998]

When you modify the exhaust to flow more air you are altering the fuel/air ratio. More air leaving = more air going in, not as much with just exhaust mods but it does increase some. The only way to compensate for it is to rejet the carbs to add more fuel. These bikes were jetted on the lean side to start with so it dosn't require much change to make them too lean.

Very simple explanation but I hope it helps.

OK. I am going to take this explanation on faith.
I am keeping my stock exhaust and avoiding this whole delima.

[tkent02]

Dammit. Almost had a set.

[ty998]

Dammit. Almost had a set.

http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=suzuki+gs+exhaust&_sacat=0

Possibility?

[kopio]

Am I right in understanding that 4-1 V&H or Macs are going to scrape when really leaning into a right hand corner?

[Mercaholic]

I modified my Kat to take a stock Bandit muffler. I opened the muffler from the rear side and gutted some of the baffles to reduce the back pressure.

The result was a nice mid range improvement with a decent, but not annoying sound.

To cover up the weld marks, I painted the entire exhaust system gloss black.

[Nessism]

Am I right in understanding that 4-1 V&H or Macs are going to scrape when really leaning into a right hand corner?

No, that is not correct unless you get one of those drag pipes.

[kirkn]

Drilling holes - ugh. The PO on my '85 GS700 drilled holes in the ends of the stock exhaust - ugh what an unpleasant noise. Louder yes, but just a flat, tinny blat! Ugh.






The holes were pretty large diameter, so I had to go with 3/8" diameter lag screws to plug the holes. Then, just painted the exposed bolt heads black and it wasn't TOO bad-looking. MUCH nicer sound, even though it WAS stock.

Kirk

[1_v8_merc]

Get a 4-1 pipe, you can run all kinds of combos.

If you run a packed muffler and do a Turn-down, all the noise will go into the asphalt and give a nice deep sound.