I have a question I have been riding at The Red River quite a bit and there was a guy down there with a

z-400, ok well, it was stock then he comes out out the next weekend with a k&n no lid with a 148

main jet and it was running pretty good it was about 3 quad lengths behind mine

it went from being 8+ quad lengths behind me to putting a K&N with no lid and 148 main jet and running

2 behind me i was impressed is that really all he had done or is he hiding something