FBIII

Last project to complete on the Euro S. Fabricating a large bore single exhaust to be run off MSDS headers. I want to be environmentally friendly so I am running 2 bullet cats. Is there an optimal distance from the collectors to place the cats?

fraggle

I always place cats under the car. If muffles the meows.

FLYVMO

While I haven't seen a recommendation specific for the 928, GM recommends the cats be installed 16"-20" from the closest cylinder head exhaust port. That applies to the factory cats on their E-rod packages (emission legal, 50 states). Too far back they don't get hot enough, and too close they get too hot and life span decreases (among other things).

Cheers!
Carl

FBIII

Thanks Carl that's what my concerns were. In my case it sounds like I should then put them as close as possible.