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Hi I e-mailed you about a year ago about being able to use the CC Inserts on my stock 91 Formula 350. When I first got the car the converters had been removed for off road use and a (Performance) muffler installed into the stock system. A trip of any length was out of the question as it had a terrible sound at about 2200 rpm we used to call “racking” when I was a kid and glass packs ruled. I asked around and was told a (other performance) system was much quieter so on we went the complete (other performance) system with 3” intermediate pipe. Better but it still had that “racking” sound especially when the car was in choke mode, I guess the mufflers on those cars are just so far back. So I got a 2 disk insert to use in conjunction with the (Other performance) muffler and cut the 3” pipe as close to the front as possible and welded it in a few Saturdays ago and just like magic, no more “racking” and I have a much more pleasant tone with a much happier wife. As a side benefit it seems a little more responsive. Thanks, Mike

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