Found some new low end Torque and the engine runs so much smoother now. When I fire it up in the mornings, it used to lope and shake somewhat and now it feels like stock.
It's such a strange feeling, doesn't even seem like the engine is running sometimes.
But I was really shocked by the low end responsiveness it has now.

 

Maybe something in your tune could have smoothed it out more with the aftermarket stuff. What did you swap back to stock other than the Corsa?

 

All I changed was the catback. I was just surprised with the difference it actually made.

 

one of the reasons i have my cutout and my stock SS truck catback..