If any of you have an old HMF tip around, it will fit the stock pipe with just a little hole reaming on the tip. The HMF spark arrester will work too. Flows alot freer and sounds better than stock, IMO.
If you know where the first baffle stops on the other side of the rear divider plate, you can drill through it with a long bit. The flow runs through 1 baffle back to the rear divider plate, then runs back toward the front of the silencer, then back out through the baffle that you can see. I have done this on a 400EX. On the 400EX is was 180 off from the baffle that you can see when you remove the spark arrester. It did make a difference on the 400EX with a filter a jetting, but it still sounded somewhat anemic compared to an aftermarket pipe.
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