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There is a bit more to the Fister than the Pedro exhaust mode. Both have the bypass pipes but the design is a bit different (not sure that makes any difference to the sound though). Supposedly the fister has more tricks up its sleeve but not exactly sure what they are. One thing I have noticed is the fister has a little metal mesh welded inside the input tubes of the exhaust on both sides. There might be more but that's the only thing I was able to see.
In terms of sound they are different. Fister is a lot more raspy which I love. I had a Pedro exhaust some time ago and it didn't sound as good. Granted I had all 4 cats back then and that had a negative impact. I only had the fister with the 2 main cats and I know it makes it louder and makes it crackle and pop.
This is my 3rd muffler so if I had to do it all over again it would be the fister with the cat delete pipes no doubt about it. It's a mod I will never regret and makes my day every time I drive the Boxster.
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