I have a 2007 YZ450F and I love this bike, theres only one little prob i have with it. It needs more low end grunt. It doesn't have the torque i want when i need to be up in a higher gear to clear a certain jump, but dont have the runway for it. I was just wondering if anybody had any suggestions out there. I'm prob gonna go for a twin bros exhaust I've heard good things but if theres any other suggestions or opinions out there please let me know.