So I was recently blessed with 05 Monte Carlo LT 3800 II. I have recently purchased these mods but have not installed them yet.

1. CAI k &n 57 -3045
2. Magnaflow street series catback exhaust system 16729
3. Zzp 2.5 downpipe with high flow catalytic converter 400 cell.
4. I will get the u-bend delete and res delete.

I am planning on getting everything installed at the same time.

Do I need a tune and what kind of tune if a need one? (Pcm, ecu, or dyno)
Or will my pcm be able to adjust properly to these changes?

Thanks in advance

 

You shouldn't need to tune, the only thing that might give the computer trouble is the cat but the most it'll do it throw a code. My 3" zzp downpipe and cat didn't have any issues though so you will probably be good

 

Your downpipe will have the u-bend delete already done.