There's an intake valley cover you can get on Ebay (don't remember what brand) that disables the DoD, and also facilitates running LSx intakes without having to modify them. I think it ran around $225.
LS4 performance
Anything you would like to know about the LS4 motor found in the 06+ SS models can be found here on this site. So if your looking for the engine performance aspect of the car you may want to look around here.
LS1/LS6 Intake swap: LS1/LS6 intake swap Sticky!!! - LS1TECH
Suspension Upgrades with options: Impala SS Bilstein BMR ZZ GXP Suspension Upgrades Done! - LS1TECH
Shift Kit Install: Shift kit install, very detailed (56K go watch a movie) - LS1TECH
Info on the LS4 and the transmission it carries: Information on the LS4, DOD, and the 4T65E-HD - LS1TECH
LS1 install guides: Information on LS1 installs
how to build a TRUE CAI: 2008 Impala SS LS4 True Cold Air / Ram Air Induction System - LS1TECH
Headers for the 5.3: HEADERS 5.3L LS4 FRONT WHEEL DRIVE HEADER 2005-2009 IMPALA SS/ MONTE CARLO/ GRAND PRIX GXP/ LA CROSS at Doug Thorley Headers dougthorleyheaders.com
Magnaflow Complete cat back exhaust: http://www.magnaflow.com/02product/shopdisplayproducts.asp
Cartuning Turbo kit: Cartuning Performance
LS1/LS6 Intake swap: LS1/LS6 intake swap Sticky!!! - LS1TECH
Suspension Upgrades with options: Impala SS Bilstein BMR ZZ GXP Suspension Upgrades Done! - LS1TECH
Shift Kit Install: Shift kit install, very detailed (56K go watch a movie) - LS1TECH
Info on the LS4 and the transmission it carries: Information on the LS4, DOD, and the 4T65E-HD - LS1TECH
LS1 install guides: Information on LS1 installs
how to build a TRUE CAI: 2008 Impala SS LS4 True Cold Air / Ram Air Induction System - LS1TECH
Headers for the 5.3: HEADERS 5.3L LS4 FRONT WHEEL DRIVE HEADER 2005-2009 IMPALA SS/ MONTE CARLO/ GRAND PRIX GXP/ LA CROSS at Doug Thorley Headers dougthorleyheaders.com
Magnaflow Complete cat back exhaust: http://www.magnaflow.com/02product/shopdisplayproducts.asp
Cartuning Turbo kit: Cartuning Performance
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