I bought my CRD with a straight pipe in place of the catalytic converter and I would like to put a catalytic back on to make it smell better and maybe quiet it down a tad. Does anybody have a recommendation on an aftermarket CC that will work with this engine that is not too expensive and is not restrictive? There is a Thrush Turbo Muffler after the straight pipe and I believe all the piping is 2.5 inch.

Would this work??
https://www.amazon.com/MagnaFlow-99006H ... G83T09N565

I suspect this would be money well wasted. You'll get almost no noticeable effect on an idling engine when the EGT's are low.

The better bet would be to get a proper tune (Green Diesel Engineering is the go-to for engine tunes) to get the engine running as efficiently as possible across all engine RPM's. The GDE eco tune would give you better mileage, power and emissions all at thre same time, and likely reduce your exhaust smell SOME (not sure how much). I really don't think a CAT is going to do what you want it to.

The backpressure on this vehicle is sufficiently low that we could not justify the expense of aftermarket exhaust and removing the catalyst makes the exhaust smell bad.