Posted a question a few weeks ago to determine if I could put 997 S twin exhaust tips on a 991 C2. Learned that they will not fit a 991 S but didn't get a definitive answer so did some research at local dealership by measuring the width of exhaust on a 997 compared to a 991 C2.

Convinced myself they would fit and then found an almost new 997 S takeoff of the twin tip exhaust on ebay. They arrived this week and tonight pulled off the original tips and tried the 997 tips.

Initially thought I had made a mistake but soon realized that a removable ring on the inside of the tips was slightly out of round and was keeping me from getting on the tip where it should be. Local Porsche dealer is a friend so drove to the dealership and their head mechanic quickly ( I mean less than a minute) used a pipe expander to straighten the ring. Should say got it back in round. Both tips went on like new. After lining up and making sure they were straight we were done. Ten minutes max to exchange. Paid 235 for the tips and am a happy camper.

 

lets see some pic...i might do the same

 

Hope this helps