Need some help with an exhaust flange. I have the older style OBX LT's with the nbs 2 bolt flange at the y-pipe. I want to upgrade my exhaust to a single 3.5" instead of the 3". Doesn't a Duramax use a similar flange to bolt up to the exhaust? Would anyone know where to find a 3.5" spring bolt coupling? I have only found 3". It seems like I am going to have to cut off the existing flange and weld on a 3-3.5" transition to either a v-band setup or a 2 or 3 bolt flange. Suggestions or hints?

 

Ok, found out that the Duramax has a completely different flange from the gas trucks. Does anyone know where to find a 2 bolt flange that's like our oem one but in 3.5"?