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Anyone, either have a new full exhaust or just a new muffler and no res, having problems with gas mileage? I got my res cut out on Friday, and I filled up on Saturday, and now only have 148 miles at a half of tank! That sucks! I usually get about 200 miles at a half of tank. I have a Hx, and I believe now that the res plays a big role in get 40 miles to the gallon. I hope that it doesn't stay like this! Anyone with the same problem?[IMG]i/expressions/face-icon-small-confused.gif[/IMG]

 
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I have a full exhaust custom cat-back I have no problems with mine as of yet, I get better gas mileage now more than I did before it.

Joe

 
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I have been testing out my car's mpg before and after the full catback exhaust. I will post my results later (when I finally do the numbers).

 
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I get about the same as u maybe it seems like i lost aliitle bit of mpg.