They look just like mine. Not too loud, and like you say, real throaty especially when you gas it. Also, as you experienced, the install is super-easy and the fit is perfect. BTW, the way they splay out, you have more room for spools.Thanks guys! I like them more each time I ride. They sound really throaty. They went on in less than 10 minutes and use all of the factory hardware and gaskets.
Maybe the cats on this bike tones down the M4's. I don't think they are particularly loud but do sound good when you're on the gas.the M4's on my gsrx were really loud, even with all the oem crap still in place... I liked them but there wasn't a cop around that didn't hear me.