Drew I am in the same search mode you are as I am backdating my 3.2 with SSI's. However, I had a '72E with SSI's and a stock 2 in 1 out factory muffler. It definitely was louder than my stock 3.2 system so I have decided to go with just a stock 2 in 1 muffler with the SSI's on my 3.2. 2 in 2 out muffler will be MUCH louder than what you presently have. Keep in mind backdating with SSI's will be somewhat louder just because you will no longer have the muffling effect of the catalytic converter.
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Kurt V
No more Porsches, but a revolving number of motorcycles.
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