GP bikes it was, and no problems with hearing them. I find that the sound is a big enough improvement over stock, I don't want them any louder. More power is a definate next step though. The Triumph tune is good enough for now and will have to suffice, the deceleration popping did seem to decrease, which I wanted, but I'm not sure how much power was added. If you want to stop by, we can't be more than 10 or 15 minutes away . PM me and I'll send you my address.