Join Date: Apr 2010
Ferrari Life Posts: 2,199
Michael, I suspect your manifolds are very similar to the ones on my 550, which are presently off the car as the engine is out.
Those double outlets on each header connect to 1 cat converter on each side of the car in a "2 in, 1 out" configuration.
I can get you the donut gasket dimensions if you like. I think I have both the new & old set out in the garage "somewhere".
The 2 hole flanges on the manifolds and the cats are very thick - probably like 3/4" or so, and as you've probably noticed, they're a slip fit and swivel around for better fitting, etc.
'99 550, Rosso Corsa / Nero, S/N:114654, Assy: 31836, Engine: 52084
High mileage, low compression, and missing on a few cylinders.....just like my cars.
Maranello Skunkworks Team Member