By necessity, I decided to build a 2 into 1 y pipe for the sbc conversion headers. I first tried finding a 2 into 1 pipe, but no local store had them, so I grabbed a couple of pieces and went at it. Although a bit ugly, I'm proud of myself for not burning a hole through a single exhaust pipe piece. Here's the custom y pipe for my headers so I could use the same rear exhaust section of the S10.