I was wondering if our cars should use a two way or a three way converter. I am about to call randium tec and get a 3.5" converter.

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97 formula w/6speed,cags skipshift eleminator, hurst billet pro shifter, 30#injectors,adjustiable fuel presure regulator,Moroso cold air induction,ported mass air sensor,accell300+ ignition box, accell 9000 wires, bosch platnum4 plugs,flomaster crossflow muffler,Lingenfiter 52mm throttle body,TPIS L98 SuperProfile cam,Crane 1:6 full roller rockers,Edelbrock subframe connectors,Edelbrock strut tower brace.

Other car is a 89 GTA w/700r4w/stage 2 shift kit,2800 converter, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body,Edelbrock ported centerbolt heads,LT1 24# injectors,holly afpr,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler,MSD 6A, accell coil,150 shot NO2. This car is currently under rebuild and restoration.

 

Third gens use a 3-way cat with air injection between the bricks.

 

When I got my car the cat was deleated so I don't know what type I need. My headers have air tubes in the headers,so do I need the type of cat with the air injection or not.

 

If you want to be 100% emissions-compliant, yes. You need the tube from the PEDES (AIR diverter) valve and a 3-way with AIR tube. However, I've heard of people who pull the AIR pump and associated equipment off just running a 3-way no AIR tube (some even with 3-way but a crimped AIR tube) cat with no adverse effects.