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The problem is that you'd end up adding quite a bit of weight (not to mention space and complexity) to the system in order to get the same flow as two larger pipes. For example:
So you can see you'd need 4 2.15" pipes to get the same cross-sectional area as 2 3" pipes.
The smaller diameter pipes would have a higher resonance frequency. I'm honestly not sure how it would sound though. It would be an interesting experiment.
The important object is to get the largest set up on the car with a minimum amount of weight. I`m afraid 4 mufflers and accompanying necessary pipes would hinder the performance not improve it.
I have a silly comment on weight in race cars 'if you throw it up and comes down, it weighs to much'...funny that never seems to work either.. i
I use to weigh everything, even the bolts and fasteners...try it sometime, I think you will be surprised..
I ran a polished aluminum bell housing in one of my fuel roadsters until I was caught through an inspection. We were normally left alone by inspectors as they considered that we were crazy anyway just for driving them.