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Use the Search tool and you will realize you essentially have only two choices: FDM Stage II or FDM Stage III. If you don't want to act on the suggestions alone, ask yourself why so many are recommending FDM. I think that you will find that most (if not all) of the FDM advocates are people that are into their 993s and are very careful about how they mod their rides. Plus, you will be dealing with two stand-up guys; and their prices are waaay more than fair.
No affiliation other than having Stage IIs and respecting their work.
Another thumbs up for the fister stg III's. I had the fabspeed maxflo's with modified airbax before. Sounded nice but not loud enough. The III's bark, pop and gurgle. Just love them!!!!
I made the mistake of trying the Stage 3's last. Only cans I found that didn't resonate. Love the sound, perfect in my mind and I'm not easy to please.