On our work trucks in the 90’s we’d have to gut the cats in the field to get the truck home. There was no way we were going to allow a tow company access to all our HVAC equip and tools from our line of sight overnight.
The motor ran like shit and of course were loud. It upset the flow characteristics of the OE exhaust. Fast forward to the 2000’s here in Cali, I discovered that adding a cat from a larger displacement, higher performance model on one of our VW that’s supercharged woke up the motor along with it’s 1/2” increase in exhaust diam in the entire system.
It has better flow, removed a known drone @ 2800 rpm, much deeper sound without any cheap aftermarket buzz. Best of all it passes the CA Air Resource Board (CARB) visual smog test because it’s part number is VW, looks correct and bolts on. Can’t comment on any increase in performance gain as there’s no before/after dyno numbers but there’s definitely better milage and no more flat spot just before 5500rpm.
Not sure if a OE 6.2 cat would work on a 5.3 or 6.0, but they’re definitely available from a scrappy and worthy of some punishment.
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