ok im curious to no if i went and bought an rsx-s ecu (with the immobilizer disabled) would it make a difference on my k20a3 i have cold air intake headers testpipe an a few other mods . all and all i just wanna no if its worth the time and money i would of course hondata it sum were down the road

 

Nope, don't do it. The ECU will try to engage the high-lift cam profile, which doesn't happen on the A3 motor.

If you were to change cams or the head or whatever, I'd still recommend going with KPro or K100 instead of a Type-S ECU.