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Random Technology makes a good high-flow cat. I also know that Magnaflow makes one as well. Not sure where you can get the RT cat, but check magnaflow's website for their's.
 

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I just bought a magnaflow hfc direct fit. It seems to be good quality, i havent installed it and probably wont until thanksgiving when i get home again. It was 150 bucks cheaper than the rt cat.
 

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then thre is cheaper... like thunder bolt





for who doesn't know about thunderbolt, here is some info

Detailed Description
Thunderbolt cat's are designed to give high performance in limited spaces. This high flow converter features a Metallic brick with 300 holes per square inch. This 100% EPA legal OBDII catalytic converter is designed for engine's up to 5.9L / 6000 lbs. (Not for use in California)

Part # - 415200
Length - 11"
Body - 4" Round
Inlet - 2"
Outlet - 2"
Brick Type - Metallic
Material - 409 Stainless Steel


the inlet/outlet range from 2inches to 3 inch, intervoule of .25 inches




i believe this si waht im gunna get. but with a o2 on it
 
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