I'd like to replace the aged and restrictive catalytic converters on my 1990 560SEC. There are several types of cats with varying oxegen sensor placements in addition to several different manufacturers available from Summit. Does anyone have the choice dialed in yet?

Ideally, I'd like to get some that fit near the stock location and require less head tube modicication etc. I've already replaced the kidney shaped resonators with a pair of straight through 18 inch glasspacks and changed the muffler to a 3-chamber flowmaster. It sound sweet now, but I know the original cats are the final restriction in the system that need to be updated.

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