A lot of people on here are constantly asking about some performance mod or new bling for there bikes and I'm kinda curious, does it really make a difference? I have never really modded any bikes. I have rebuilt plenty, maintained, fixed and changed sprockets, seats,suspension n such to suit my riding, but ultimately, every bike I have ever bought was sold similar to how I bought it. I started wondering about this the other day when I bought a new exhaust for my quad after the last one started to rust. Looks great, but I don't notice much difference in performance and any bikes I have ever bought that had an aftermarket pipe, I didn't have the factory one to compare. Does anyone really notice performance gains from individual mods? If not, how much does it take to be noticeable and is it really worth the cost?