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Originally Posted by midgetracing28
if u take out the muffler u kill gas mileage and low end torque. removing just the cats so long as u still have a muffler doesnt do to much maybea power gain of a few horsepower not really worth taking it off.
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Not sure how you are getting a link between gas mileage and a muffler, so I'll just skip that one. As far as the lowend torque, it's not so much the muffler, it's the restriction which causes some backpressure. Generally the muffler isn't considered as much as the diameter of the piping, but regardless, this doesn't apply to turbo cars, only NA, as mentioned previously a couple of times.