I just put an axle back flowmaster system on my 07gt and I got the sct tuner with a jla intake. I'm wondering what's the next step for the exhaust. I don't want to throw any cel's but would like more power and more aggressive sound. A friend of mine told me to throw some hi flow cats on. Also the guy at brenspeed said my tuner would not need a reflash and I'm not sure about that.
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