Dont take the cats off unless you dont want to be able to pass emissions. Backpressure shouldnt be a problem if you end up losing the cats, but dont just cut them off of the old pipe, get a brand new offroad x or h pipe. As far as exhaust, flowmasters sound great in my opinion, but they are just not loud enough for me. If you just want a little louder than stock, go with flowmaster.ack_98gt said:i have the stock exhaust on my 98gt and would like to upgrade to something a little louder, quicker. thinking about flowmasters. any ideas? also, should cats be taken off or would the loss of back pressure screw things up?
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