I own an EVO X 2011 MR with ETS cat back and intercooler. I wanted to know if I should have the ECU re mapped and change the air filter or not. Will it give me better performance and better gas mileage? Thanks guys for helping!

 

Yes, yes, yes.

 

A bone stock EVO should be tuned, let alone if you start adding parts.

 

You will never regret a reputable tune!

 

Then I shall tune it. Anyone good in SoCal ?

 

Cobb socal/road race engineering seem to be pretty popular. There are a bunch of road tune people as well in LA.