The 97 boxster has one set of cats... not two.
I have Deluboz' headers and muffler on my 97 and it's plenty loud. Sizeable resonance at 2-3k though... but I got used to it with the top up. Top down it's just glorious all the way through the powerband and quiet as a mouse on the freeway with the cruise control set. Deluboz's muffler is really light compared to stock and much cooler... my rear trunk is no longer a rolling pizza warming unit.
BTW, I'm learning that all twin chamber mufflers create the resonance issues I have now.
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