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Curtis sparks?
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Posted by: Honda400exrox

How loud is the curtis sparks pipe with a jet kit and air filter on a 400EX? How many decibles? because ive heard that they are really loud

Posted by: Hotdog

i got 105 decibals at the local track.

Posted by: Honda400exrox

is there a diff in sound and power between the x-4 and x-6 also are those pipes good for 400EX's with no engine mods?

Posted by: Fast350ex

The x-4 is good for a mostly stock engine, the x-6 is for heavily modified engines.

Posted by: Honda400exrox

If you put an X-6 on a non heavily modified engine will it hurt the stock engine?

Posted by: Fast350ex

I'm not shure, you might want to check with Sparks on that one.