I don't think the MSDS headers are worth the money. I'go bang for the buck...gut the precats, forget the y pipe and do true duals. If you get an aftermarket y, insulate it around the oil pan...if you look at the stock y pipe, there's a heat shield on it. It's vry close to hte oil pan and very hot, no shielding = hotter oil. Hot oil = blown engine.
