Re: 4.7 upgrade performance
There are lots of things to do but if you had to one thing get a programmer. Superchips is probably your best bet.
09 laredo 4.7 28x w/ QD2 Superchip 91 Perf tune w/trans app, K&N CAI, jet 180 tstat, Bilstein 5100 struts and shocks, srt8 front & rear swaybars. 255/65/17 General Grabber at2's