Man I can't remember, but you may have some transmission whine. It it gets louder when you get off the gas, you may have the front bevel gear bearing going out. Or you may hear a little final drive noise.I have Cobra dragsters on my bike. In their stock core form they are LOUD. I picked up a couple of Cobra's quiet cores to quiet things down a bit and billet tips to dress things up. I had a heck of a time getting the cores in, to the point that I had to put a stick of pine on them and tap them into place...so they're a tight fit.
Here come the questions and where my confusion is. My bike now runs at a sound level that I'm happy with but I can now hear this kinda whining sound when I accelerate. I'm not sure if it's normal and always been there or not, like I said, the pipes were loud and drowned out everything else when the engine was on. Is this type of sound normal for a mean streak?
The reason that I'm questioning is that the cores were tight going in but the tips that I ordered were not even close to fitting. According to Cobra's site, the pipes are supposed to be full length 2.5" heat shields, my pipes are 2.25" OD. They have Cobra stamped on them and the cores that I removed definitely looked like the regular cobra cores.
Anyhow, is "whining" normal on a quieted down mean streak or am I now giving this thing too much back pressure?