what size downpipe on a 2000 F250 PS?

[FULL FORCE]

My buddy just bought a 00 f250 ps,what size downpipe is good to run on these,he is going to run a 4" exhaust on it,do they have a 3.5 DP for these?what is stock on one,It looks like it may have a 3" already,just making sure it is not stock.

 

[Mike]

MBRP makes a 4" turbo back system. So, 4" DP's will fit, but will probably require some massaging of the firewall. I think Dale at Tymar has 3.5 to 4 DP's also.

 

[jvencius]

MBRP makes a 4" turbo back system. So, 4" DP's will fit, but will probably require some massaging of the firewall. I think Dale at Tymar has 3.5 to 4 DP's also.

My 4" MBRP downpipe fit just fine with no firewall "modification" necessary. Granted, there's not a lot of clearance, but there's at least 1/2" all around the pipe of free air space.