Hey all! Just wanted to introduce myself. Yes I already have questions. I just purchased a Nelson Tune 93 Octane for my 2006 GMC Sierra Z71 excab, pretty excited bout it! It's an everyday driver and I am going to keep it stock. I just wanted some more performance out of my truck. I have a Volant CAI and Exhaust. I wanted to know what exactly the Servos and Shift Kits do for the truck? Also wanted to know if it's worth purchasing/adding them to my truck? I plan on having the truck till she's old and grey! Thanks.


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