Gotta say... I put on an mbrp this year and it's WAY quiet compared to what I was expecting. Half as loud as the mbrp I put on my 02 RMK. Much better for the neighbors. I would rather support the sled shed but found the mbrp on ebay for $150.
I have the thing, and i would have to say that is pretty loud. If I were to buy another, I would go with the Super Q, or the Ultra Q. They are supposed to actually not cause hp loss. compared to most, including the thing.
WHAT??? Speak up, I can't hear ya I just put a Skinz super Q on my 860 and it's quiter than the HPS that was on there. It's pretty close to SLP's can for the XP.
I just switched out my mbrp for the Super Q, Ultra Q, and this can is light and quiet, only down fall is the NOS bottle does not fit anymore. No more ear plugs though. Oh ya the welds on the can are not that inpressive, they could have spent a little more time grinding before sending to the coaters shop, I hope it doesn't crack.
I installed an MBRP "Trail Can" on my 03 ZX it was louder than stock but not too loud. I did not notice any performance gain nor loss however the weight savings was noticeable.
I just installed my HPS on my 06', and I think it has a great suttle rap. At idle it's not to far off stock, when you crack it open it has a really nice tone. Not ear plug materail for sure. I ride with two other guys and one has the thing, and a MBRP, and they are way louder than mine.
I have a sled shed Thing can on my 01', it sounds good, a little loud, might try the Stealth Thing. Very nice cans, more expensive, but you get what you pay for, nice welds, works awesome!