cr85 exhaust question

[doonanracing]

Have a DEP exhaust now and picked up a cr85 for an extra motor that has a Bill's Exhaust system. Tried finding out more on this exhaust system not really much is available from my search. It had allot of pull etc down low it seems but was in a dirt bike not the JB frame. Might be nice for Arenacros or tight tracks. Has anybody ever tried this exhaust system and if so where was the best power when using it. Bottom? Mid or top end? Just tring to figure out if it is worth swapping out every now and then. Thanks

[THARNESS]

We used a DEP pipe and silencer on the old style (2004 and under) cr85 motors and it seemed to work great, espically on a stock motor. My son got a couple of holeshots at the nationals with a bone stock engine and a DEP pipe and silencer. Once we had the cylinder ported it didn't seem to like that pipe as much.