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In my experience the starting point should be how much muffler you can get into what car.
The best place to start would be to find a rear muffler for each car. For eg for the 1st gen rx-7 guys.
Price between $100 and $200
Pipe size between 2.5" and 3.5" (to cover NA, small and large turbos).
Sized to fill the entire rear muffler section ~8.0"x10.0"x22.0"
Centre offset and centre centre available.
The non turbo guys will need a 2nd muffler before the diff hump to keep noise reasonable
You could do the same for the FC3S and the FD3S, and then 99% of cars would be covered.
For the FC3S I'm thinking twin rear section 2.25 for non turbos, 2.5 and 3.0 for turbos.
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