intercooler without ecu software? 2.5L

[cdf2.5]

for cost reasons im wanting to buy a cheaper intercooler (same size as c2's stage 2 FMIC) to add to my c2 stage 1. Would it be a horrible idea to do this without an ecu tune if i did not increase boost? What if i did increase boost? Or would there just be less power than if I had the tune. I am new to turbocharging things so forgive me.

[87vr6]

Upgrading your intercooler can be done by its self. No tune needed.

[cdf2.5]

Upgrading your intercooler can be done by its self. No tune needed.

even if the stage 1 turbo im getting does NOT come with an intercooler??

[87vr6]

even if.. yes......