I hate to say it but with the epa restraints, the huge cans are here to stay...stock. The day is coming too and is here in many places where an mbrp or similar can is illegal due to noise and is being enforced. Not here, and not anytime hopefully, but in many areas it is that way. Many many forms of motorsports racing has decible tests as part of the prerace tech inspection. Fail a sound check, and you don't race. Like it or not, that is a fact of life as we know it and it will get more strict as time goes on. Tough to make a small lightweight can as quiet as the "suitcase". I am also guessing that the "suitcase" helps clean emmisions up better as well, whicch the sleds must meet or that can't roll out the door at the factories!!! The aftermarket intake systems that most of run would not meet the sound levels that the factory must meet. That is also the reason for the foam on the inside of most hoods. To cut down on sound levels when measured by the feds...Next will be the tracks. We have all heard a sled whistle down the road. A stocker that you don't hear the engine, but at 70-100mph track speed, the current 2"+ tracks are loud!!! Don't flame me, I'm saying that the track noise bothers me at all, but when it comes to feds doing a sound check, that is alot of noixe and is the next issue that I see them addressing. Yes, I think it is going too far, but that can be said for them trying to take way our 2 strokes too.