Yes, I'll look at the fuel trims again, but mileage has been within expectations. The plugs are old but I can pull those and see how they look. No other codes on the VW besides cat efficiency. Could be a leaky injector or a vacuum leak, I suppose.

I am going to stick extra shielding on the cats between the body and the floorboard. I'll have enough space to add a very short bracket and a bunch of aluminum plate between them and everything else.

The flange area is tight left and right but fine up and down, as far as fitting these small-bodied cats in goes. I have to get them in staggered fore and aft, as they are slightly too wide right next to each other.

Eventually I will put a new resonator in if this all works, but for now its going to be more chop and weld at those flanges on the midpipe. I saved the OEM ones I chopped off the manifolds, just in case I can use them again, but I think my header-cat assemblies will be too long.

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2001 E53 3.0 5pd