What do u think is the best pipe for a 2003 400 ex for more speed and better throttle response??

 

Dirtwheels magazine did a review of exhausts for the 400ex. They put the White Brothers "e" series at the top.
Here is a link to the review.

http://www.dirtwheelsmag.com/detail.asp?id=181

 

my vote goes to curtis sparks

 

Sparks & white Bros are pretty close. You can't go wrong with either one. There both better than the rest. If I had
to pick one though. I would get the sparks x-6.

 

If I had to do it again I agree with the rest of the guys here "Curtis Sparks, x-6".

 

SPARKS!!!

 

The E-series is starting to fall apart. We have 2. The older one is broke right at the muffler, the second one has a brace welded on it from the factory right where the first one broke. It now is starting to crack so I say stay away from white bros. The sparks x-6 is the way to go.

 

If i had one I would go with Sparks, but what do you guys think about LRD?

 

..Sparks..LRD..or Hitricks...in that order..

 

I have a Big Gun exhaust system and I love it, it sounds great and made a nice performance increase.