These are probably newbie questions but here goes.... 1. I have a 1994 GMC Suburban K1500. Not looking to race the thing or anything like that, but I've heard that some chips not only improve performance but gas mileage. At least it did on my european sedan. What should I get? 2. How does one go about replacing the oddball stock stereo in the '94 with a DIN model without destrying the dashboard? Is there some kind of an adapter available? 3. Anyone ever seen an aftermarket center-hump under dash console that works with/around/inspite of the 4wd shifter? Thanks in advance for your help.