These are not just pulleys that replace the harmonic balancer. These are Redesigned harmonic blancers made to be lighter. There are numerous companies that make lighter harmonic balancers for Chevys, Fords, and every other type of engine. It's proven to work, and our car will show the same results.

Our cars have enough "momentum" to get them moving. I don't feel that a lightened crank pulley will make this undriveable, actually I know it won't. The harmonic blancers on these are known to wear and tear much sooner than most cars. I will post dyno sheets when they came in.

As for the cat delete pipes, I would imagine taking it to a local exhaust shop would not only be cheaper, but probably much easier.