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Lethal 680 package or custom tune


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I just purchased a new 2013 Shelby and would like to add some mods. Would you guys recommend the Lethal 680 package or should I make the two hour drive to American Muscle for a custom tune? I'm sure they can add the Throttle body and air intake like the Lethal kit.

Also, will these cars pass inspection with an off-road exhaust like the "x" pipe?

Thanks for your help.

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I would seek out a tuner, as you car already makes @ or near 600rwhp. Your goals can be discussed and a plan developed to meet that end. Canned tunes are fine, but nothing beats datalogging & a dyno.

Kooks mfgs. what they call a " green " X pipe that is supposed to pass inspections, not sure if it can be used outside of a header / X pipe install.

( a good tuner shop can answer that question )

Edited by idle-hour
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Thanks Idle-hour,

I appreciate your input. That's what I was thinking, but I've only dealt with Vipers in the past so the tuner is a new concept to me. [ Gen. IV Vipers can't be modified beyond exhaust without engine lights] I am going to contact American Muscle and see what we can work out.

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