Hey all. I just took my stock muffler off my quad, i removed the baffle and spark arrester, drilled extra holes around the tip (youll see what i mean if you look at it, their is 4 1/4" Holes in it stock, i put about 10) then, i used masking tape to make a perfect circle around Just in front of the Second Mouning bracket, and then the same on the end leaving about 1/4" from the end. it removes about 3" total from the muffler. It made the quad a little louder then before, when i just had the baffle out, but wow! the quad pulls alot harder from top to bottem!! oh yea, i used a chop saw to make the cut perfect, then i welded around where i cut the two, good free mod [img]i/expressions/face-icon-small-happy.gif[/img] oh yea, i went up a size on the mains.

 

Yup, People do this all the time with aftermarket pipes believe it or not. THat's how racers have the shorty silencers. Not on 2 strokes, but on the 4 strokes. It makes it really loud and gives you a decent power gain.

-fox

 

no extra HP's but extra DB's sounds more like it..lol

 

lol yea...but you never no maybe there is a feeeeeeewwwww hp

 

put it together, Less Backpressure = More HP

 

isnt back pressure good to have in some ways

 

Ive watched guys put together and tune a few mini-sprint car motors and they were carefully picking and choosing headers, collectors, and mufflers to end up with just the right length to compliment their cams, cam timing, and overall powerband placement. Short is for top end, long for torque. The thing Is I see fourwheeler people cutting theirs shorter than these guys were using to make max power on their motors that turn double the RPMs. If somone did a before and after dyno test it might not be pretty depending on the pipe you started with. Dont you think if making it shorter would make it faster the aftermarket manufactuers would have do it?
On the other hand though, yes reducing the back pressure of a STOCK muffler will probably make more power since they have huge backpressure so reducing some changes it from horrible to slightly better. Its like going from breathing through a straw to breathing through a straw with holes in it. Its lightly easier but your still breathing through a straw.

 

In essence, a drag pipe [img]i/expressions/face-icon-small-smile.gif[/img]

 

Jakal, nice to see another custom motor-modded warrior out there !

 

I shoudlnt really be bugging this guy, it probably does help a good bit on a stock pipe. Im just tired of seeing good aftermarket mufflers cut to nothing and the guys swearing they gained some bottom end. Derrrr. Im still not sure those drag pipes the raptor guys run actually work. I cant imagine the motor running better with that little backpressure, but I guess if they say it works it must work.