I thought I would post this, since many times I've gotten info from this board I couldn't find anywhere else. give a little back I guess. I put a new cat back on my '89 lx hatch today. The old system was 2 chamber flows, 2 1/2" flowmaster tailpipes. I was never really happy with the way it sounded, plus, the passenger side flowtube had been cut about an inch shorter and welded at some point. which led to a real PITA when putting the tailpipes back on (I had turndowns for a long time). so I ordered a mac catback kit, 2 1/2" pipe with 3 1/2" tips. I paid about $320 for it. the fit and finish was excellent, it comes with all hardware needed. the think I like most about it is that it uses flanges that you can unbolt, to hold the pipes together. so if you need to drop your gas tank, you don't have to cut the tailpipes off. it takes most of the pain out of working with exhaust, especially if you're doing it with the car on stands like me. and the sound...in my opinion, much better. it has the same tone as the flowmasters, but louder and more aggressive. much louder at idle. granted, I never had 3 1/2" tailipipes with the flows, so I don't know how that would sound. probably pretty good. the car has gone from being "loud" to being "obnoxiously loud" which in my book, is perfect. :SNSign: