I personally have the ZZP PCM and dont have any problems w/ it. It did remove my speed limiter and made my shifts a little harder. Thats the main things I noticed. If you want something around the same price I would say try Intense or WBS. I know a lot of people like Intenses PCM's but I dont have any personal experience w/ them. A lot of people on this forum highly recommend Overkill but I think they are a little more expensive. But may be worth that extra cash.