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When my buddy and I did a vh45de swap we had the same issue at the Y-pipe. Turns out some of the welds burned through and we warped the flanges. It was all exhaust leak. The smoke in the cabin and all the extreme heat coming through the hole. Go on courtesy nissan .com and order that ring that seals the trans tunnel, its like 20 bucks. Keep the smoke out. Than check all your flanges and welds.
I had all my flanges decked flat to make sure the seal is good. It was real check an performance shop can do it.
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