V666

I think I may have screwed up. I have a lq4 with a pt-88 with a 4" downpipe with a 4" exhaust cutout. So I originally was gonna run the stock ecu wich would use narrow bands on each header. plans changed now gonna run a Holley Dominator or HP which uses only wide band (correct??) Problem may be...if I am running a wide band o2 sensor for the Holley what do I do if I wanna open the exhaust dump? I read I cant install the wide band (or bands) before the turbo. My 4" downpipe Y's right outta the turbo into a dump pipe down about 18" to the electronic 4" cutout.