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don't bother with the high flow the neon cat flows pretty good and if go too free flowing with the exhaust you will loose power down low. Unless you go turbo then no backpreure= good
and if you want mod that gives both power and gas milage get a under drive pulley.
no you are fine. technically since you still have a cat, that is providing enough back pressure, so you are not running a free flow exhaust. you will be fine
Well right now since I changed too new plugs and wires with all my mods I now get 29 in the city and 35 highway so the srt exhaust has not hurt my gas mileage its helped out nicely especilly with a glasspack on her.
yes your friend is correct you lose backpressure and will lose performance....BUT it wont hurt your motor or anything else and you will not need what he said....to keep your performance just install a glasspack muffler they are cheap and you can get it done at your local muffler shop...I would get a glasspack muffler if I were you.