Raymond 5.7 89 Formula

I am going to replace cats on my car it came stock with dual cats. Think I am goinng to go with Catco cats. I called Summit Racing and they said I would use part#6005 2.25 inlet and outlet. But would like to use 2.50 inlet and outlet #6006. Went to discountconverter.com to check prices and then I see the 6000 series cats but scroll down and see 2600 series cats which say High Flow then I would use #2606 but cat is 16.5 inches compared to other which is 14 inches. Anyone know what the difference is between these cats I thought all Catco Cats were high flow. Thanks for any info.

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SLP 1 5/8 Headers,ATR catback exhaust,SLP cold air box,Crane 1:6 roller rockers,Bosch plugs and MSD wires,MSD Coil,Fastchip,Borg Warner 9 bolt 3:27,Corvette Servo,ROH ZS 17X9.5 Goodyear GSC,s 275/40/17

Mo

I ordered mine through Summit, 2.5" in/out, can't remember the PN though. I got the universal ones as opposed to the direct fit...much cheaper

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90 IROC 5.7l (L98)
ram air, K&N's, air foil,Flows

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