I have a 1997 c1500 with the 5.7L. I was wanting to change out my flowmaster exhaust from a single 50 series muffler to true dual super 44 or dual 40 series.(which would sound better). also i was wanting to install some shorty headers and high flow cats but not sure what size pipe would work best to keep it sounding deep. the motor is stock for now. also wanted to know what are some good bolt on mods i can do.