Domingo definitely has the aesthetic vote... looks like the factory built it. That was one ov my options.
The other option was the contoured cut-out, weld to floor version. I would think that keeping the stronger 2x3 piece intact and cutting through the weaker floor sheetmetal would be stronger though. I'd also like a lower profile connector than both ov these ideas... my exhaust is going out the side T/A style.
