Damage using straight pipes? - Sportbike Forum: Sportbike Motorcycle Forums
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post #1 of 4 (permalink) Old 08-19-2007, 11:06 AM Thread Starter
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Damage using straight pipes?

I had asked this question before and couldn't recall the answer. My buddy just removed the entire muffler from his '07 GSXR 750 and replaced it with a straight pipe. I had seen one other guy do this and asked on the forum what damage this could potentially cause to the engine. (aside from voiding any warranty!) I have tried to tell him this was a bad idea and he just keeps asking why. He loves the sound and insists it has more torque. Any truth to this? He basically wanted more noise without dropping the $550 for a slip on.
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post #2 of 4 (permalink) Old 08-20-2007, 11:16 AM
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I think the way it works is that the less baffling = less backpressure on the engine/exhaust = less compression. I know for a fact that I lost compression/torque on my 96 S-10 when I added a flowmaster exhaust system. I could feel the lack of torque. Now, I know that an s-10 and a gsxr750 are slightly different but that's my

can anyone back me up on this?
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post #3 of 4 (permalink) Old 08-20-2007, 02:31 PM
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This might help.

Destroying a myth.

In God, we trust; all others must provide data.
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post #4 of 4 (permalink) Old 08-22-2007, 07:34 PM
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If he likes the noise then he should do it, but tell him to have the bike put on a dyno before he does, and again afterwards. then adjust the fuel mixture with a new fuel map.

It will be acceptable when their is a very small dip in torque on the low end and 2-5 more horse on the top.

Here is an interesting read on the dynamics of exhaust flow, And most of it is true! They don't tell you that the gains and losses they talk about are nominal in most applications, but hey if you go to the main site they are selling baffles for cruisers.


I just really want a bike with a turbo, because their are those times when you pull up too a stop light next to a cop, and I think a really loud PPTTTSHIIISHHHHHHHH would make his day. =P
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