A catalytic converter acts as a filtration system in the exhaust that comes out of your Chevy Trailblazer engine. Most states require an emission test, so you must have a catalytic converter on your vehicle to pass it. States that don't require an emission test can fine you up to $2500 for not having a catalytic converter on your vehicle. Removing your Blazer's catalytic converter will increase the power and improve gas mileage a bit as it decreases back pressure on the engine.
Purchase a replacement straight pipe that will bolt into the area the catalytic converter was under your Chevy Blazer. Tell them your Chevy Blazer year and they can get you the proper length and bolt pattern of straight pipe to put under your Chevy Blazer.
Lay on your back. Crawl under your Chevy Blazer and find the catalytic converter. It is a device that looks like a smaller muffler and it is bolted to the exhaust pipe exiting the engine.
Unscrew the four bolts holding the front and back of your catalytic converter to the exhaust pipes under your Chevy Blazer.
Place the straight pipe in the area the catalytic converter was. Screw it into place. The pipe will carry exhaust to your muffler and reduce noise on your vehicle.
