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Discussion Starter · #1 ·
I have a 2007.5 lmm. Im not sure of the tuning that is on it right now or who wrote the tunes but i do have a 5 position switch but i was wondering if i ordered efi though ppei when i flashed their tunes onto my truck would it overide and erase the current tunes on my truck? New to tuning so be easy on me lol
 

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If it's running alright I would leave it alone, to many horror stories of re-tuning with EPA on everyone and emissions compliant tuning.
 

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If it’s deleted an you do that your gonna have a mess, ppei or anyone for that matter now doesn’t make tunes for a deleted truck, there emissions compliant, if it ain’t broke don’t fix it
 
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