Hey guys I know this sounds stupid but I need to know how the stock downpipe connects to the rest of the exhaust (or catalytic convert if applicable). I do not have access to look in person at my '99 F-350 right now and I'm trying to order a new exhaust and cant find any pictures on the internet. Is it at all the same as to how an OBS 7.3 downpipe connects to the exhaust? That would work out great since I have a full OBS 7.3 exhaust system here (4" which is the route I am taking). Thanks In advance.

 

 

Mine is 4" turbo back courtesy of PO but the downpipe has a short tail on it then it connects to the next piece of pipe with a regular muffler clamp. I never paid any attention to what it does from there.

 

Are you asking whether the OBS exhaust would fit on your SD from the downpipe back? The stock connection on mine is not a muffler clamp, but a bolted flange connection. I never looked at my '97's connection, but I can't imagine it was any different, so as long as the downpipe diameters are the same I think they would bolt together. However the OBS frame is different from the 99 up SD frames (I believe the SD frames are wider), so I would expect the exhaust routing / mounting is somewhat different. As John mentioned, the cost of a proper SD turbo back 4" system is affordable enough that it's probably not worth trying to make the OBS exhaust fit.

 

No I dont plan on using my OBS downpipe I will leave the stock one on this 99. I just wanna know how the downpipe connects to the rest of the exhaust is all

 

My truck did not have a cat so just connects to the exhaust piping underneath. The OEM downpipe is longer which is why you pretty much need to cut it out. My MBRP was shorter so dropped in (had the turbo and up-pipes out so made it easy) with an extra section that connects shortly after the turn to go under the truck making installation much easier than removal.