are they much faster then the older models ive herd they are and my friend killed on in his stock srt4 and we ran an 06 the other day n we stayed even then for some odd reason he pulled extremly hard way to hard for a stock car...we think he had spray there so much stuff u can hide under there hoods so we couldnt tell n he had a gauge but then closed something n we didnt see it... and before we ran n after he put his hand behind his backseat u dont keep doing that before a race n after there isnt much a reason 2... lol but i dunno he said the new ones have more hp less TQ the older ones have less hp but more tq maybe vis versa