All of these questions are for a 4 stroke.


do most aftermarket exhuast systems come with a spark arrester?

what is the quietest exhuast that still gives good gains( besides the stock one)

 

Not all and I'd have to say the FMF Quiet system.

 

if it doesn't come with a spark arrestor the company usually will sell it as an add on. and u can also get most pipes an optional quite core insert for many pipes, this makes the pipe quiter but decreases hp by a little...