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I dug through my iron pile to find the old crossover, cat and manifolds I had removed to install the Downey headers. I cut the flanges off of the crossover. The crossover tube measures 1.5" diameter. Looks like there would need to be a blank off plate for one of the outlets on the driver side manifold.

Thinking I will get some two inch mandrel bends and weld up a Y pipe using factory crossover flanges and the old cat flange. I will test install it on the 2wd auto.

DUDE, i;ve been looking for someone FOREVER that has done this.
Can you measure the downpipe flange on the driver side manifold for me? I need to get one cut out of stainless... and i've been searching for some dimensions for weeks... it would be GREATLY appreciated... i need to get it done because i have an e-test in a month....

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim