I searched this topic and didnt find any info on this,

I saw the HFP SI muffler for sale on collegehillshonda.com it's just a muffler so i am assuming it would fit on an 08 I4 Coupe. Has anyone seen this done before or know if it can be done? i am not very good with exhaust systems so any help would be very much appreciated, here is the link

http://www.collegehillshonda.com/honda_civic_2dr_accessories/06_08_civic_factory_performance.htm

You will have to have a muffler shop make the piping to connect it to the factory exhaust. It would probably cost more than just buying a universal muffler and having it installed.