Hi Scotty, I own a 2009 Suzuki Swift 1.5L. The normal edition, not the sports edition. I was thinking of removing my catcon (only my catcon). How will it affect my engine? Will I get more power and better mileage? And lastly, will it hurt my engine in any way?

those are only for anti pollution reasons. Remove them, vehicles run better, but will turn check engine lights on. Just realize in most places it is against the law to remove them. And they do check that during vehicle inspections if they do that in your area.

Even if I do it properly with both pre and post con o2 sensor built back in properly I will still have the check engine light?