S52 Sunbelt 2 Exhaust setup?

[Torquenstein]

I've been looking at different setups for a while and still can't decide on what route to go, so looking for suggestions before I throw the engine in the car. I do have a number of goals and criteria that I need to achieve with this setup, so here we go

CURRENT SETUP:
1. S52B32
2. Sunbelt Stage 2 Cams
3. M50 mani w/ 3.5 HFM
4. 10lbs Flywheel

GOALS:
1. Primarily autocross/rallycross "peak horsepower not a concern"
2. Needs to retain mid range torque "usable powerband"
3. Must be lower than 88 dB "compliance with several sanctions"
4. Ground clearance "rallycross/suspension travel"

WHAT I NEED:
1. Headers
2. Exhaust Pipe Sizing
3. Routing "single or dual after collectors?" "X-pipe?"
4. Muffler/Resonator

[Daeldalus]

For staying under sound regulations you would want to do a dual pipe setup. Smaller diameter pipe is usually quieter. Dual resonators is a must, plus it sounds better that way. For the muffler a larger case size helps keep sound levels down without hurting flow if you use a perforated core muffler.