no ones real sure yet as to what they are really gonna do. they have only dynoed them on a stock car Vs pacesetters (which i have now). LT's made more hp than the pacesetters, even with having 8* of false knock retard (they only had the knock when the LT's were on). the pacessters also pretty much just fell off at 5100 rpm on the stock car, and mine doesnt even shift till after 6K along with not being stock.