Look up the guys who did the up side down M90 build recently for an example of ridiculous wasted effort for inefficient results, yet respectable work input.
If you want, go buy the Mace Air to Air intercooler plate for an outlet. It is the worst way to route a positive displacement blower, since they need to pack air in the volume below them to create pressure... Hence our short path to the LIM and heads after the M90, and majority of roots blowers intercooled with sandwiched plates or short paths with cores inside, like LSA/LS9 lids.
www.maceengineering.com.au
90's Thunderbird Supercoupes had something similar for their Eatons, and you hear all the crickets from how those performed.
Enjoy.
If you want, go buy the Mace Air to Air intercooler plate for an outlet. It is the worst way to route a positive displacement blower, since they need to pack air in the volume below them to create pressure... Hence our short path to the LIM and heads after the M90, and majority of roots blowers intercooled with sandwiched plates or short paths with cores inside, like LSA/LS9 lids.

52MM AIR TO AIR INTERCOOLER PLATE TO SUIT L67 SUPERCHARGED 3.8L V6
Product no.AA601,Harness the full potential of your L67 supercharged V6 commodore with this unique air-to-air intercooler adaptor plate.
90's Thunderbird Supercoupes had something similar for their Eatons, and you hear all the crickets from how those performed.
Enjoy.