With the mods that you have now, you might be good with just a Cortex tune (superchips cortex 2950 I believe). You can change the shift firmness and get it specifically tuned for your current mods. I would save a good tune until you get longtubes or something more major.
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2008 LR G8GT: Rotofab, HSRK, rear muffler delete, Polished SS wheels and some audio stuff
Satin black 1999 Trans Am: LT's, ORY, SLP LM1, Lid, Ruff 278's, more audio.. Sold 
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