There is no set of Heddars that are currently made that can improve the performance of any vehicle I own. I have tried them all and I have never seen a "Seat of the Pants" improvment. If I can not feel an improvment then the money waisted in Heddars just makes me look like an Idiot. Trust me I know. I still have a set on my 74 SuperDuty. I just have not taken them off yet.
