is there any gain to replacing both HOT and COLD side.. or just replacing the Hot side or vice versus.. wanting to try to increase some airflow..

 

The depends on your setup. I have home made 3" intercooler pipes and EGR delete on mine and I like how it runs. I honestly couldn't tell you # benefits though. I figure it couldn't hurt to have more volume. You'll still have the restrictions at the Y bridge and intake runners though.

 

on lly it makes a difference in temps, not anything your going to feel using your butt-o-meter though

 

I would change both hot and cold, as well as the intercooler itself. once you do that, you should notice an increase in hp and torque. engines crave cold dence air and the colder you make it the dencer it gets. its expensive to upgrade all that at once, but well worth it. i would go with Banks or PPE intercooler. (me i'm a banks fan)