I don't hear much about the Double Barrel or Noleen. It appears to me that the Double Barrel would be much like the DMC. I've heard the Noleen system is pretty good from one source.

I'm looking for a full exhaust system that will deliver maximum hp for a race 440EX. I currently have a WB R4 slip on and I don't think the head pipe will allow max flow for the 440 with 12.5:1 compression and a port job.

 

One of my friends I race with has a Noleen. His motor is stock. The pipe doesn't have very much low rpm power at all I think because of the size of the head pipes. It should work really well on a modified motor.

 

If you want the most flow, the DMC is the best choice. I am getting one really soon, because my Big Gun restricts flow too much. The DMC works better when your engine is built, I think there is no pipe like it, but it is up to you.

 

I race with a person who has a 440 kit with a noleen pipe, he said that it adds, but thats from his mouth not mine so i dont know for sure.

 

ts,

Who is your friend? I believe I may know who you are talking about, but I'm not sure.