My bro upgraded the exhaust on his '09 Si coupe to an HFP so he had his stock one laying around. We had seen a post on the forum of a guy who had installed one on his 9th sedan by taking off the tip... and we were curious to see if it would fit my coupe. Anyway we took it to a guy he knows here in LA and he was able to install it without any modifications to the exhaust or to my coupe (he was even able to install it with the tip). I think it gives my car a nice humm... to those of you who have wondered... well, it fits!!!!