Never thought about the speedo gear. Will have to find one of those! RPM is lower for sure. Haven't had it over 50 mph that the speedo shows as the kit say to give it 100 mile brake in before trying highway speeds but 4th seems to have a lot left at 50 around town. Howl seems to be a good way to describe it when in motion. At idle sounds just as before but for sure in motion I have a louder "howl" then before. It gets louder faster and quieter as I slow and come to a stop. Exhaust then? Or might be something I missed in the rear?