Long tubes and catted x need a tune or can you run without?
I got LT's and a catted x on my car. I have a tuner and tune in the car from before the new mods. Do I need to revise my tune or ? I know revising it will prob give it a few more hp but is it necesary? Drove about 50 miles and no codes. I have all the sensors hooked up. Sometimes it stumbles at idle but never dies. Thanks ahead of time for any info.
Im doing a procharger in a few weeks so I dont really want to go through the hassle of getting a new tune etc. because I will have to dyno it once the blower goes on.