Cat vs. hollowed cat vs. testpipe

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Feb 25, 2009 | 08:34 AM
  #16  
Quote: I used to run a "gutted cat" in my Eclipse SDS race car and replaced it with a set of test pipes. I seen a slight hp increase but that might have been due to weather conditions etc...

If its a DD and its a strict state with EPA laws just get a highflow cat and test pipe, if not just get a test pipe would be my thought.
I think more people would get a high flow cat if it wasn't for the cost, it shows very little power increase from the high flow cat than with the testpipe, but a lot of price difference.
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