Yes the o2 housing fits up to a regular downpipe. Its a psi-fi kit, I just did away with the recirculating wg pipe and replaced it with a dumptube instead, and changed the 5 bolt o2 housing flange to a 4 bolt. This should fit a dbb 50 trim as long as the 4 bolt flange on a 50 trim is the same size as the 4 bolt flange is on my sc61.
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