I'm sure this topic has probably been beaten to death, but my brother want's the MOST power he can get from a full system exhaust. Sound is not an issue. He races flat track and leaves it in 4th gear wrapped out, high RPM. Anyone know of links to shootouts and/or dyno tests for full exhaust systems for the 400ex? Right now, he is looking into a Curtis Sparks exhaust or HMF.

Thanks for any information you can provide.

 

Go to Ctracing.com then go to 400ex then once your there click on dirt wheels pipe shootout i think thats what it is

 

The DMC alien full system is very impressive, go with that.

 

ive herd good things about the Curtis Sparks pipe but ive ridin a 400ex with a HMF and that was very impressive

 

FMF Ti-4 and PowerBomb Header, K&N with outerwears, and vented airbox lid. Be carefull! Any manufacturer can build a pipe that looks good on a dyno! But, you don't ride a dyno!

 

If it shows big powergains on a dyno, then it's going to show big power gains while riding.

Seems like everyone has a different opinion on what kind of exhaust to get...

 

Well, say a pipe looks good on the dyno, but out on the trail somebody lets the bike idle to long and the thing gets so hot it melts??? Or it's so fragile it doesn't stand up to abuse out on the trail. A pipe has to work in the real world, not just in the shop. Seems like everybody is selling pipes these days, so I am kind of wary about a lot of them that aren't time tested manufacturers. Shootouts are nice, but that sure isn't the whole story.

So, the one of the best things one can do is ask here in the forum, and see how peoples pipes have done in the real world!

 

last pipe shootout i saw in dirtwheels i think between about 10 pipes said that white bros. and big gun had the most hp gains

 

I know, but that was back in 2001. That's 3 years ago. Many more pipes have come out since then. That's why we don't refer to that particular shootout.

 

last shootout i saw the big gun actually had the one of dynos out of all the pipes. it actually produced less power than stock with the spark arrestor in and 2 or 3 tenths more than stock with the spark arrestor out. however, the low end torque of that pipe seems to be good.