work with the basics
porting a viper with single pipe is pointless. If you want the sled faster and dont want pipes then you need to work on clutching,clutching,clutching, thats assuming you have good traction like a 1.25" ripsaw track or studded 1 inch track to begin with. Get a good selection of clutch componets and spend alot of time along with good notes and you will be very surprised at what a little hard work will achieve.