Iirc SDP. Randall would know though.
It's not just the down pipe though, lots of other parts needed some massaging and a truck load of swear words to be installed.
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Huh, SDP is the only DP that his fit my truck (manual tranny) that clears the bell housing and the firewall.
Edit: There now may be others, but at the time it was the only one and more recently I tried a different brand when I put in the WG and it was off quite a bit so I ended up going to back to the SDP and modifying it to accept the WG outlet.