I also have the yoshi r-77 full system. 4-2-1. I wasn't thrilled with the way it sounded, I ripped the baffle out and I couldn't be happier. In my opinion this is the best exhaust system out there. Sounds great, drops 35 lbs. looks awesome (I have the stainless with carbon cap), and adds some horses. What more could you want? Plus ripping out the baffle is really easy, it takes literally 4.3 seconds.