well my buddy want to buy a full system pipe for his 2002 400ex he ride in the woods and sometimes MX race tracks. he was looking at the pro circuit t-4, big gun race, fmf power core, white brothers E and R. so which of these pipes would be the best for him.

 

I have the FMF PowerBomb Header and PowerCore IV on the EX and am very pleased. The Ti-4 had not come out yet when I bought the PC, but if I were going to do it today I would go that route.

 

i like the pro curcuit pipe,
i was real impressed with the sound and performance

 

i told him to buy a sparks pipe but i am getting one and he didn't want to copy me but hes not sure yet which is the best