I have a full 4-2 system. I like them, but then I only paid $430 for them off of e-bay, new in the box. I don't think they are very loud, though louder than stock. Mine are the black painted pipes with stainless covered cans, thoughthe cans have black ends. My only complaint is that the black paint on the pipes sucks and they rust quickly. So, I wanna get 'em coated so they will look better and last longer. Otherwise, I like 'em, just fine. I have the K&N filter, no airbox mods and the Ivan's TRE. I do NOT have a PowerCommander or other re-mapping devise. I have no flat spots/hesitation or anything negative with the FI other than a little surge at idle. That is not a problem. Surge on the road or a flat spot etc. would bother me, at any rpm, so I won't re-map. It does rev quicker and throttle response is improved. Pictures to come.