Thread: Custom Tune question.
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Old Wed, September 30th, 2009, 06:47 PM
JWBFX4 JWBFX4 is offline
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The rule of thumb is, if the mods(changes) came after the cats no new tune needed.

Its when you get into long tube headers and stuff that you need a new tune.

So as long as you just stuck a maggie muffler on then you are good to go.
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