I went for the cheapest full exhaust I could find, a Big Gun system. I simply wanted something on there that would help the intake side of my mods. I personally could care less in how it looks, as long as it performs. And from what I have seen, there isn't much difference, performace wise, between all the systems. Let's face it, there is only so much power you can extract without doing internal mods, whether they big a big bore kit or cams. I do have a throttle body and ECU from a CBR250R that are waiting in the wings. I have put off installing those items because the exhaust is choking the system as it is. So once I have the exhaust, I think I'll get off my rear and do it all at once. On a side note, I have had a hard time finding CBR cams on the cheap. I'm not trying to sink a pile of money into the bike. So I'm taking my time seeking out deals and/or good used parts. I'll keep ya posted!