Well on my way home from work i stopped at the shop who put exhaust on my truck . I wanted a rough estimate on what it would cost to do the 31 Sedan. I had to take a step back when the guy said he didn't know till it was done . I said not even a rough idea i mean i don't want a $1200 exhaust bill . He still said not till it was done he mentioned master cyl. which i said will be on the firewall and only thing below will be battery and drive line .. I mentioned also it would be allmost a straight shot back with plenty of clearance . I heard he does some great rod exhaust but he must have never done a 31 Sedan with out somewhat a idea. I can see $400 maybe a bit more what you guy's think .