i sent some information about the car through their web site just to get their suggestion. the next day, Lenny himself called me to talk one on one. the guy really knows his ****. i placed the order during that phone call, and have never regretted it. the 8 1/2" 5500 has great street manners. trans temps have never been an issue with this 'verter. it has yet to be track tested, but i have all the confidence in it.