It'll be a while before I'm done with this project but next on my list is a sound track loadable onto a smart phone that can be played thru car sterio system with some external underneath vehicle speakers that play a very deep rumble type sound -------It will have various tracks that the driver can learn the timing from so he knows when to wing the revs in time with the sound track----------hows that sound to you guys???????? rump,rump,whooome, rump rump