ok I am researching for my good neighbor on his 2001 crew cab 4x4 chevy... only mod so far is edge juice with attitude.. well, I have noticed his egts are pretty high and am pretty sure a new exhaust with cat delete would help this. My question is I have heard when you remove the cat on the truck it will sent a CEL and cause problems.. is there a fix for this as not having to invest into a diff program like efi live to eliminate this problem? while taking things out I have also heard a egr delete is good to do but will cause CEL also.. it's a california truck so it has all that good stuff on it. thanks for the help I appreciate it. I myself have a cummins. Diesel is the only way to go though.