Question to those who use a titek o2 housing...are you guys using a donut gasket or a flat gasket? also with the spring bolts to let the downpipe have some leeway or just a regular nut and bolt?

Current situation....my downpipe is up too high and stiff as hell, which can cause a crack if i don't loosen it up. Also, i'm not on a donut gasket, so the downpipe is lifted higher which in turn is pressed up right against my t-case. So i'm wondering how your titek o2 is setup as far as the bolts and gasket. Are you using OEM donut gasket and spring bolts?

Will much appreciate this as i need to get this fixed asap. I don't want to cause further damage to the t-case if there is any. Thanks.