i bought this for my 07 gsxr and boy does it sound awesome. It is ten times louder than the stock muffler. If you like being extremely loud then this is the exhaust for you. The first thing i noticed was how bad the throttle response was on the low end. When first taking off it almost bogs out until it catches. But power was improved mid range. Next the instructions are fairly easy to follow however it does help watching a youtube video of someone putting it on to get a better understanding. Hardest part was getting the linkage bolt off to flip it. Over all i would say it is a good buy, like i said if you like being loud and heard all over town then this is the exhaust for you.
Two Brothers M-2 Black Series Slip-On Exhaust
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I absolutely love this exhaust, it looks fantastic on my bike and sounds equally as awesome. At first I was concerned because it was not nearly as loud as I thought, but the low throaty tone was still there. Eventually after riding for a while the sound did get a little louder. I finally took off my catalytic converter and put on a mid pipe and now I have the best sound I could ask for. Everyone always turns their head when I pass by.
If you run your rpm up to the rev limiter the db's may go as high as 100 to 102+db's.
I would recommend taking a look at the installation guide on this exhaust found here: http://gfx.motosport.com/product/twobrothers/005-24204xV_Inst.pdf