J.R. - 10/19/2016 7:25 PM

Truck cat systems require more cat capacity than car.

It sounds like you have the two elongated cats that are mated next to each other with one engine exhaust pipe pipes entering each cat and after the cats they flow into a single pipe. Correct?

If so, you may want to build the system with the two cats in parallel but probably offset so as to fir them in the space. A reputable exhaust shop can guide you through this.

Will the O2 sensors upstream from the cats remain in place?
Will the install try to match fit the end of the engine pipes to your custom catalytic system?
Will the install try to match fir the end of the custom catalytic system to the remainder of the exhaust?

How many O2 sensors are there AFTER the cat?

Then we'll talk about triggering a Check Engine light.

J.R. - 10/20/2016 9:25 PM

So your cat is probably close to or identical to those in the Europa G500s. 463 490 5414 $2400.

As long as your after market system does not require that the sensors be relocated, all should be good. In the rear, the sensors are at an angle and not in the exhaust stream. In the front they are way up in the exhaust so no issue.

I would find a reputable exhaust shop and ask them if they can build you a custom setup with two cats and stainless pipe and set it up like the factory has it. You can go to the shop with the brand and model of the Cats you want to use and see what they say. Your cats are going onto a truck, not a car and the cat needs to be for a truck. They are on the hook regulation wise if they are the installer. Plan on a couple of trips.

For the front, they should be able to match the current attachment fittings.

For the rear, they could cut the pipe off at the weld between the cat and the factory pipe leaving several inches to work with.

See diagram.