the flomaster does not make more power on a Dyno than the stock H2 exaust. I have seen this first hand on an 03 H2 ,it will sound Kool and drone at hyway speeds ,but that's it
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Originally Posted by peppers&eggs
I don't have any headers on mine but I did put the Hypertec E-Con programmer, Air Raid intake & T-Body spacer and a Flowmaster exhaust. It made the truck a lot more snappier and gave it way more "get up and go". I really didn't notice any city MPG gains but I am getting between 15-16 on the highway. I don't really know what it was before, but I think that is pretty good for a truck that size. Hope this was helpful.
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