You can drive without a catalytic converter for as long as you wish. Note that the longer you drive without a catalytic converter, the more potential damage on the engine. When minor issues occur, bigger problems follow, and your repairs/replacement may become expensive. How much does it cost to fix a catalytic converter?
What happens if you remove the catalytic converter?
Since the catalytic converter works to decrease the effect of the gases emerging from the engine, it can also muffle the sounds of the exhaust together with the vehicle's muffler. With it removed, you will get to experience a low-pitched, louder, and a more distinctive exhaust sound.
Can you straight pipe without removing catalytic converter?
I'm looking to make it louder and i was just concerned about the cats being removed if I straight pipe it. Yes, it will remove the catalytic converters. If you have to pass emissions, it will no longe pass.