Quote:
Originally posted by pipes
Hey Ant.....I see in your description of your vehicle, you have a 3" downpipe and 3" exhaust. If I am understanding this right, the down pipe your referring to is one to replace the cat. If I am wrong.......disregard this. If I'm right, I thought that any one whom replaces the cat would bring on an engine light due to the computer not seeing any diff. from the sensors which would be mounted on the inlet and outlet sides of the cat. Any info on this ???? I am thinking about doing this on my GT. Thanks. 
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a high flow cat does not mean a less efficient one. the reductuins should be the same (or better on some models) as stock. Just with better flow - about 30% on average. PLUS upping to 3" you really open the flow for the turbo to do its job!!