What I have tested, the Hookers are good for tq but limit peak power somewhat, the primaries are extremely long. TTI's are a pain, there really isn't room for underchassis headers, never used the Hedmans, have built my own fenderwells. The shock towers can be chopped and the top ends of the shocks moved outside for a little more room, and pushing the firewall a little back behind the wheels gives you enough room not to limit the tire size.