I have a 81 cj5 with a CSB 350. Almost everything on the vehicle is not stock, and I find when I ask a mechanic or shop for help, all they want to do is type in the year, make and model and be told what it should use. For what I am looking for, a stock cj5 exhaust will not work.
What I am looking to do is make this thing as quiet and silent as possible for use in the woods, yet maintain as much performance power as possible. I am well aware that reducing air flow will reduce performance and that I am looking for a unicorn. However, I need a solution that has a balance, leaning more toward the quiet if I have to sacrifice any power.
I am also designing it to be a decent climber/mudder to play with. I have no intention of traveling to any rock climbing trails, most of what I get into is steep hill that are VERY muddy.
Using a dual exhaust system with stock mufflers designed for the engine (from a 1973 camaro) is too loud due to the short distance from the exhaust manifold to the rear of the vehicle.
What I have researched to make it quiet:
1. Use a X cross over for heat dissipation
2. Mount Muffler as far to rear as possible
3. Always use the largest muffler you can fit underneath (plenty of room under, SOA, changing lift to OME 2.5 (FROM SuPERLIFT 4in with 2in shackle lift)
4. Tail pipe diameter 2 1/4 or 2 1/2
5. Use the largest resonators you can fit
6. If you have distance to travel use long tapered cone reducers.
7. Most performance mufflers are much LOUDER than stock
8. A quiet muffler will be packed with steel wool and glass to reduce sound waves.
9. reducing air flow= reducing engine performance
The issues I see with project:
1. The limited distance between the exhaust manifold and the rear of the vehicle.
2. The dropped transfer case could limit the possibility of a X Cross over.
I have found at least one manufacturer (SOLO Performance) which makes some products under their STEALTH line which is primarily steel wool packed mufflers, resonators, etc. A bit pricey (stainless steel), but the first I have found online.
My first design is the following:
From each manifold come out in 2.5in pipe and immediately Y, (4 pipes in total)
. From each pipe, put a resonator in front of the stealth muffler. So there would be FOUR resonators and FOUR mufflers, pretty much coming straight off the manifold and less than a foot before entering a 24in resonator, and then directly into a 11x15 muffler.
My question is, would the air flow
be greater, equal or less than if I did the design with one pipe, resonator, muffler off of each manifold? Since the air is immediately doubled (Y) into 2 paths I would think this would cut the backflow in half. Is that right?
Would the noise
be greater, equal or less than if I did the design with one pipe, resonator, muffler off of each manifold? Since there are 4 mufflers, I would suspect that the sound reduction will double that of 2, however, the backflow should double. or will it?
I know the COST WILL be double
but I know I am looking for something very unique.
Thanks for any help and direction, I hope I dont sound like a *******.