a number of exhaust mfgs make turn down tips. Search the usual suspects like AWE, Fabspeed, TPC, GMG, Sharkwerks, Borla, etc. Or just have a local welder or exhaust shop make one up for you quickly.
The typical 95 db limit is a lot louder than you think it might be so you could be w/in spec... download an app from the googelplay or iTunes store to test first.
Good luck
