Originally Posted by garner
I'm sure I could run it without a tune but lethal says it runs rich doing that. I read it as your mpg will go to shit, so I didn't wanna be getting like 13 mpg on the trip back from Houston. The 20.4ish I got both ways is low enough
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Yeah, don't do it. It will just foul your 02's and smell/run like crap. It's not going to make that much of a difference that it can't wait until you have time to do it properly. I've got the Lethal H as well. It sounds "okay", but then again I'm not a big fan of how these new 5.0's sound to begin with. The Hpipe/Gt500's was the closest I could get to the classic Mustang sound.