I have a 2000 400EX with a WB racing cam, JE 11:1 piston, and WB rev box. I have a K&N air filter on it too with a Yoshi slip on but have been thinking about getting a full system, like a curtis sparks. I do alot of drag racing and I was wandering if putting a full system would make a big difference over the yoshi slip on or should I put my money in somethin else, like a carb or somethin. Thanks for any advice!!