I'm trying to quiet my exhaust with resonators, and have two questions. First, what type resonator is the most effective? My plan is to use a 1.5" drilled stainless pipe with 3 perforated disks spaced 1" apart encircling the pipe (similar to Car Chemistry's). It will go in a 3" SS exhaust pipe. The second question is: before or after the muffler (Flowmaster 70)? The exhaust pipes run straight from the headers with only one 35 degree bend, and their only 4 ft. long. The motor is a 454. Loud as hell. What should I do?