I've read about the air box mod with the filter, jetting and muffler that everyone does for the Raptor. I don't want to get into the engine yet, but I do want some performance improvement.

I did a similar mod for my DR350 by cutting out a bigger hole in the airbox, rejetting and moding the stock muffler. I saw an increase in horse power and now I'd like to do the same to my 2004 Raptor.

Can you list which parts you bought for these mods.

 

i got a plain k & n air filter and a big gun pipe its awesome

 

A good pipe...Yoshi, LTE, White Bros E series..something like that...proflow air filter kit and re-jet your carbs