Noise level: My major gripe with the Tanaka is the sound level. I like the performance, very dependable, pull hard. I have to wear earplugs to make riding more comfortable . With the Jetpro Pipe, the sound coming is as if I was wearing an earplug. More muffled. It also create a lower tone instead of the high pitch sound of a normal 2 stroke. The engine now sound more muscular. Now I actually want to here the sound. I think it's the high pitch sound that I don't like. Keep in mind also the some of the sound is coming from the intake, so it is hard to compare it to 4 stroke. At idle its sounds like a four stroke. This is considering that it only has one silencer. I can add another silencer to muffle the sound more. Perfomance: Top speed was increased from 34 mph to 38. Hills that I used to do 28, now goes 31. Extreme hill that I can go 12mph, now 14 mph. There is only little bit of torque increase between 4-6 rpm, it comes alive is after about 6.5 to max rpm, feels like there is a turbo. Quality: Lifetime Warranty, material used on the pipe itself is heavy gauge. The fittings and attachment used are high quality. Rubber bushings are used to dampen the vibration of the engine, prevent the joints on the pipe from cracking and it is secured very well. Looking at it in person is screams quality Looks: Subjective, but when I opened the box I feel it belongs in museum of modern art. It looks nicer alone than in the bike. But that's just my opinion.