I'm considering remove cat. Anybody do this and what should I look out for. Want to increase HP. Factory is a bout 370 I believe. Maybe upgrade water cooling radiator or add oil cooler. I'll also change exhaust system to hopefully increase HP.

 

Or just do a pulley change on the supercharger.

Car already has a factory oil cooler too. Intercooler water pump upgrade is a great idea of you're adding power.

 

You’ll likely need to upgrade the head gaskets next given the age they’re in prior to modifications.

 

Removing rear cats depends on if rear cat is aft of the rear O2 sensor and your final exhaust sniffer test to pass emissions

fwd cats must remain

The engine will regulate the same if rear O2 sensor is fwd of rear cats being removed

 

Removing the cat can increase power but may trigger a CEL—O2 spacers or a tune can help. Upgrading the radiator and adding an oil cooler are good ideas if you push the car hard. A high-flow exhaust will also help with performance!