i have an 89 iroc 305 that came from the factory with dual cats going into a single pipe. i plan on adding headers. should i keep the dual cats or opt for a single high flow cat thanks

 

If you can, I would do the best of both worlds, get 2 high flow cats. Catco converters work great and flow very well and are only about $100 each! If not, keep the dual cats and replace them with dual high flow ones later.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

keeping both cats is a good idea. having 2 will keep emiisions down, and you will worry less about passing inspections. If you do put 2 high flow cats on, the exhaust flow would be a lot higher than with one high flow, although if you have a negative backpressure EGR, then that may cause that system not to work, because there won't be enough backpressure.