Dyno Pipe Test 2

[Terse]

Originally Posted by sanger69

Terse, Please dont forget us with the next shootout.

Vox Formula ATV Exhaust - Performance exhaust for KTM, Yamaha and Honda ATVs. A perfect fit for your Quad.

I see the pipe is stated as being a tuned slip on.... I've never tested just slip on's before. I never wanted to test a slip on and a full pipe in the same test for fear it may not be a fair comparison and some one complaining.

[jr4racing56]

thanks for the info

[smiths2cd]

Hello everyone, does anyone have an opinion about the Duncan fatboy 4 for their YFZ450? I have had mine sine I bought my quad new, and have been dedicated to duncan since started racing quads back in 1988.. I know there are possible better exsaust systems, but being that I have never compared, does anyone have an opinion about the fatboy, and what are some of the mods you use and types of riding you prefer with the fatboy 4. my jetting specs are 45 pilot, 178main NVCQ needle, and soon to add a #35 leak jet( to eliminate the throttle bog).. Thank you,

[Terse]

Originally Posted by smiths2cd

Hello everyone, does anyone have an opinion about the Duncan fatboy 4 for their YFZ450? I have had mine sine I bought my quad new, and have been dedicated to duncan since started racing quads back in 1988.. I know there are possible better exsaust systems, but being that I have never compared, does anyone have an opinion about the fatboy, and what are some of the mods you use and types of riding you prefer with the fatboy 4. my jetting specs are 45 pilot, 178main NVCQ needle, and soon to add a #35 leak jet( to eliminate the throttle bog).. Thank you,

I think that pipe sounds great. Looks ok, and holds up well. As far as a true comparison, I have not tested one on a dyno against any other pipes or by it's self but I have ridden with one and on that yfz it was a powerful bike. I can tell it is a good low and mid range pipe from riding with it, but as far a tuning and the over rev range of the pipe I can not say. IMO it is a very good mx style pipe. A good pipe will pull you from corner to corner and IMO that pipe that well.