Which of these pipe's are loudest but have a good deep sound to them.
My friend has the white bro. E-series and it's pretty darn loud he runs it with out a spark arrestor.

#1 Big Gun Race series.
#2 Duncan Double Barrell
#3 Graydon
#4 Yoshi.

 

this is what i think. i owner a 400 and have a t-4 pro circuit. Its load (very load) it give me low end to mid range. i had a white bros. e series and i thought it sux to be honest. i like the yoshi. One of my riding buddies has one and it has a good sound and good perforence. the new big is good. the older big gun are weak sound like a load fart. I geuss the new ones has goten better. the other two ive never seen on a quad around here.

 

I love my big gun and after I got it and my partner got his E series, he soon got rid of it in favor of my race series BIG GUN! Will never change it out.

 

I don't know those are all really good pipes. The Big Gun Race Series I heard was an awesome pipe. The Double Barrell though, man I have personally heard one of those on a 400ex and it was awesome!!! I liked it because it had a distinct sound to it. You could literally pick it out of a crowd. The Graydon, I don't know anything about it or have not heard one so I can't say anything about it. As for the Yoshi, those also sound pretty good as well. Supposivly, the yoshi, did a pretty nice job in low, mid, and top end power as with the other 3 mentioned too. As for myself, I have a FMF Powercore 4 S/A. I am very pleased with the power increase. It does a really nice job. A friend of mine that I ride with has the same pipe as I do and he is also pleased with the increased performance. No matter what, to get a new pipe you are going to spend at least over $200. It's definately worth the power increase no matter what pipe you deside to put on your 400ex.

Fourtracker14

 

I like the way that the duncan looks.
Have you ever rode a quad with one on it.
Was it louder than the E-series.

Thanks

 

lrd bigbore pipe ...they are going to ban this pipe next year from racing ....to loud ..not kidding ...wanna buy it,ill need to find a differnt pipe for next year..