I have built some...but we have not delved very deep into onroad.....to put out any sort of competitive product we would need to develop it in a competition environment.and unfortunately there is not anywhere even remotely close enough to travel to to race.......Also we do not really have any smooth surfaces anywhere near us.....so testing out a 80MPH road car just in not possible......I would love to , but it is not practical.....I have quite a few drag engines , but not much for road race engines other then for GT car