We started out with Hooker fenderwells on our 440 duster and went to the
CPPAs(i believe these are now the TTIs)and gained hp.Also freed up the room
in the wheel wells for taller tires which was well worth it there on a drag car.I
have the CPPAs on my dart as well.They were a pain to install i had to do
alot of beating and banging to get them to clear the steering gear and torsion
bars.