I am thinking about taking mine out. The only reason I ask is because I just rejetted the other day and im going to kick myself if I have to rejet for taking the arrester out. I should have done it the other day when I had it apart.

 

You may have to. Do you have your air box lid on or off? If you still have the airbox lid on then you may not have to. Once you take the lid off you definately will have to.

 

I still have my lid on and im running 145/150 right now with a pro design filter.

 

I had this setup with my raptor, and never had to rejet. Ran good for me. [img]i/expressions/face-icon-small-wink.gif[/img]

 

The difference on flow is minimal at best without the spark arrester. DO NOT take the lid off with the stock muffler (spark arrester or not). More than enough air is available using the stock intake sytem in conjunction with the stock muffler. Meaning all you will get is more intake noise and no more power too the ground.
Gary