A good quality high flow catalytic converter isn't going to kill enough power on a street car to really be noticeable. If it's a cruiser, not smelling of exhaust is kind of nice.
I've debated catalytic converters myself. More specifically because if you have a vintage plate in Colorado they try and limit your use of the vehicle. I'm fairly sure that's ex post facto law, but that's another day.
The problem is I'm not convinced that where the cats would need to go wouldn't effect the reading of the oxygen sensor in the header collector. If you can place the cat 10-12" down stream of the oxygen sensor, that would be best, but then the cat isn't going to function as well as you've already dissipated a good amount of heat from the combustion process. OP if you do decide to go that direction, I'd love to hear how it works out for you.
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-Jason
1969 Pontiac Firebird
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