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... if I took out my cat and muffler and resonator, and brought a straight pipe back into a collection box in the back of my truck and out 2- five inch miter cut stacks, what kind of problems would I run into?..... besides noise pollution?... should I leave the cat on?
I would use a piece of flexpipe to connect the main exhaust to the collection box (free movement, no stress or twisting anything)
collection box is my made up word for a 5' long steel 1' by 1' square tube sealed on both ends, placed in the box of the truck to mount the stacks on neatly ....... I'll draw somthing up
One problem I see with a setup like that is debris collecting in your collection box. Tree leaves, bugs, and birds tend to wind up in stacks and at least with the pipes, I can rev the motor and blow that stuff out. The box will have too many places for things to settle and get trapped. I would go with a Y-pipe of some kind in the bed and then make a box to shield the pipe. If you can be religious about putting caps on your stacks when not in use, you will probably be ok.
If you're wondering, yes I have had a to launch a bird carcass or 2 out of my stacks. It's kind of funny to watch feathers float out of your pipes when the truck is idling.
Thats true, you could cut a hole and mount some studs around it and use some wingnuts and a header style cap that way you could also have a gasket to seal it good. Just shove your hand or a vacumn hose in there once or twice a year to keep it clear.