These kits really do help. They all seem to be the same. We have worked with someone on a slightly different version we're hoping works out better, but these are the best answer we've found at this point. We have this on our race car and street sprite. On the race car we've been experimenting with a different seal, if that proves better, we will have that available as an option. These need to be carefully fitted. We sometimes found that some extra machining may need done to some pieces for clearance. We've also found that the quality of the included seal is not very good. We've started using a much nicer seal that lasts much longer. When we instal one, we throw away the seal that comes in the kit and use this uprated seal instead.