Best High Flow Cats or Maybe a Whole New exhaust System

Gary Dawson

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I'm looking for recommendations for the best flowing cats for my 2005 convertible. It's pretty much stock with only the addition of underdrive pulleys and 3.55 gears. I would also appreciate hearing from guys that have replaced the cats and mufflers. I would be happy if it's a little louder too. Oh hell, maybe I should just go whole hog with headers and everything new all the way back... comments?
 

MoparMap

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Not sure I've heard of many different aftermarket cats in general. RandomTech seems to be the main name that comes up the most often. I think that is what Bellanger includes in their kits, but I could be wrong. To my ears I really like the Borla kits. They have a deeper tone that is more reminiscent of a muscle car. The Corsa kits have a more exotic, higher pitched race-y sound to me. Bellanger I think is somewhere in the middle. There are quite a few others out there though. The Mopar race exhaust is more or less just a 3" version of the Borla kit (I think Borla makes it for them actually). Volume-wise I'm not sure I think there is a huge difference between them. They are all definitely louder than stock, but I think comparatively to each other they tend to be somewhat similar. I don't think I noticed a huge difference in volume with my headers either, though I did notice the sound was a little more "buzzy" than with stock manifolds (which are really just shorty headers anyway if you look at them).

Generally speaking though it's all personal preference. My cam made a bigger difference in sound than anything else I've done on my car exhaust-wise.
 
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Gary Dawson

Gary Dawson

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Thanks guys. Yes although Indiana does not do emission testing I will likely be selling the car sometime in the next year or so. No cats will be problematic for some states but I would love to run it with test tubes. I doubt there is a shop that would remove my cats unless I hauled it in on a trailer and swore it was for track use only. :)

Honestly, no cats would probably accomplish everything I'm looking for on the cheap.
 

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