That setup will likely be too loud for most of us as those look to be essentially straight through. If you replaced those with Flowmasters that have chambers and baffeling then they may work for us, but the dreaded "drone" is the hardest thing to work out without testing. Jake Raby at Flat 6 Innovations was looking for some test mufflers so you may want to talk to him.
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Tommy
2000 Boxster S
1973 914
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