I brought in a pair of catalytic converters to be put on and Carlos was able to install them in about 1.5 hours although many people say it can take up to 4. It is a challenging job only because there is not much room to work on in that area of my car. He took them right out of the box and got to work no questions asked. Car started up right after and the work looked great and well done. It was also the cheapest price from all the shops I have looked in to.