i am installing a set of hooker LT headers and Hooker pipe. Do i need to buy so hi flow cats or will it be okay to run w/o them. Emissions check wont be a problem where i live, but i didnt know if it the car will run right w/o them.

 

The car will run fine without them.. You'll get an SES light unless you buy O2 Sims for the rear O2's.

Your exhaust fumes will also be a lot more potent because the cats are there to burn off some of the fuel.

Other than that, your car will be fine.