[mixja]

:edit: OK, are the ASR sports cats going to be sold separately? I.e. can I use the factory muffler or an Eisenham sport catback system with the ASR down pipes (sports cats)?

Pretty impressive gains, regarding the comments from Eisenham engineers, there is a common saying, 75-80% of performance gains are made in the first 20-25% of the exhaust system...of course if the OEM system is free flowing then there isn't much point, but deleting the secondary cats will definitely help...