I know a tune always helps but im trying to do only mods that i can change back to stock in the event that I need to use my warranty. My mods are this a hks 3" cat back with high flow cat, k&n drop in, greddy bov, hks coilovers, and a hyperflow intercooler. She runs fine now but if I add a downpipe do you think ill need a tune.

 

I know it may not be the best question but im just wondering if it'll make it run crappy

 

you wont get anywhere near the gains those mods provide as a set without a tune, and assuming an '03-'05 car, a fuel pump as well as a boost controller

 

a lot of ppl run tbe's without tunes since it's one of the very first things they do. you'll be fine but i'm wondering why you bought an intercooler already.

 

the previous owner put the intercooler on and sold the stocker so i just left it