I don't see a 1600 staying with a 5 car anymore anywhere. maybe curt geer, rob mac, bud ward, or some of the other studly dudes but I'd be suprised. if i was dicing it up with a 1600 car through a whole race in barstow.In Barstow a 1600 pulls same lap times as 5u. In more wide-open terrain the 5u is a little faster on lap times, but honestly not by much. Prep costs are similar, initial purchase prices are not.