While at Stillen Day I talked to the Injen sales representatives about their Sedan exhaust. According to these guys, the Injen system is dual catback to twin resonators. The two pipes from the resonators combine into a single pipe just ahead of the muffler. The muffler is single-in - single out with one large tip. (I think the single tip was what they finally agreed upon.)

Power gains... They quoted 17 hp for the combination of the Injen intake and exhaust. I asked if Injen didn't claim about 12 hp for their CAI by itself? Yep!

Availability... at least 30 days.