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Tricky79 · 12-07-2011, 09:20 PM

I was looking at a new sportbike and am into the 600 class. I am noticing that most manufacturers have started to replace the underseat exhaust with a side exit exhaust. I know that sportbikes use to always have a side exhaust so I was wondering if there was a downside to the underseat style?

The Spaceman · 12-08-2011, 04:56 AM

There are 2 downsides to underseat exhausts:

- They heat up the seating area.

- The mass of the mufflers and pipes is not concentrated at the center of the bike as well as it is with an under-engine setup.

Having said that, my own opinion is that the underseat exhaust style is worth whatever minor gains are had by under-engine configurations. This is especially true when compared to the huge cans you'll see along the sides of bikes like the ZX-14 etc.

trenttheuncatchable · 12-08-2011, 06:59 AM

A carbon fiber (aftermarket) underseat exhaust can help with "heat up the seating area". A CF exhaust does cost more than standard aluminum, though.

12-07-2011, 09:20 PM	#1
Tricky79 Registered Member Join Date: Apr 2011 Posts: 3	Underseat Exhaust vs. Side Exhaust I was looking at a new sportbike and am into the 600 class. I am noticing that most manufacturers have started to replace the underseat exhaust with a side exit exhaust. I know that sportbikes use to always have a side exhaust so I was wondering if there was a downside to the underseat style?

12-08-2011, 04:56 AM	#2
The Spaceman Registered Member Join Date: Aug 2011 Posts: 1,352	There are 2 downsides to underseat exhausts: - They heat up the seating area. - The mass of the mufflers and pipes is not concentrated at the center of the bike as well as it is with an under-engine setup. Having said that, my own opinion is that the underseat exhaust style is worth whatever minor gains are had by under-engine configurations. This is especially true when compared to the huge cans you'll see along the sides of bikes like the ZX-14 etc. __________________ The Texas DOT has announced that: "Traffic accidents are caused by skid marks." The state DOT researchers found and documented a near-100% correlation between traffic accidents and skid marks. "Wherever we find these cars colliding," he explained, "we also find these skid marks."

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12-08-2011, 06:59 AM	#3
trenttheuncatchable Founding Member Join Date: Jun 2007 Posts: 834	A carbon fiber (aftermarket) underseat exhaust can help with "heat up the seating area". A CF exhaust does cost more than standard aluminum, though.