3.5 inch downpipe

[JeepSJ]

Who makes a 3.5 inch downpipe? I can only find 3" downpipes. Even the kits that are advertised as 3.5 inch have a 3 inch downpipe and step up to 3.5 under the truck. Does anyone know where I can find a true 3.5 inch downpipe?

Alternately, how about a flange for a stock pipe? If I have that, I can have a down pipe built.

[MTTwister]

3" is about the max you can squeeze n there for a downpipe. Then expands up to 3.5 or 4 - as the wallet allows.

[JeepSJ]

This isn't in a GM truck. I have a nice, unobstructed 6" wide path to route the downpipe.

[99gmccrew]

Pinnacle exhaust makes a 3.5" downpipe.