Downpipe Question for an OBS

[FARM69]

I'm in a slight situation here. I'm finishing up on my installation with my HX50 and wondering what the heck I'm gonna do about my downpipe. I hacked up the existing 3" downpipe when I removed the old turbo/up-pipes the works.

Has anyone ran a 4" super duty down pipe on their OBS? I know there are a couple guys on this board that have or had the same turbo setup that I have. Just wondering how you guys did it. Thanks.

 

[UNBROKEN]

For even a 3.5" DP you have to massage the lower firewall quite a bit. That
4" will be a bear.

 

[FARM69]

Yeah, I've already took the sawzall and dye grinder to the firewall flange. I'd be happy with a 3.5" if I could find one.