PCM Tuning- negates Factory Warranty? - Hummer Forums by Elcova

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PCM Tuning- negates Factory Warranty?

03-27-2009, 07:59 PM

Brianb231

Hummer Novice

Join Date: Mar 2009

Posts: 12

Re: PCM Tuning- negates Factory Warranty?

I have heard that those handheld plug and play tuners are not as good as having someone plug in with a laptop and road tune it? Is that true?

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