Sadly that is the only way to make them even half useful. You need a fan to draw in air from hood scoop and push through the top mount intercooler. Without a fan, hot air from the engine pay will pass through the intercooler and out the vent. It becomes an interheater then, lol.
Adown side...
You're welcome.
I do all my own mechanical work, and have a good machinist/welder friend who helps with fabrication stuff (like my intercooler).
In terms of shops that do mechanical work, I always recommend this shop in Victoria: Home - https://simoesauto.ca/
I don't think they'll do...
Stage one: Scrap EGR system, buy manual boost controller and set to 12 psi. Install EGT and boost gauge. 10-15% power increase.
Stage two: Add intercooler, set boost to 15-20psi or so. Use a means of tricking MAP sensor to keep computer from going to fuel cut when boost exceeds 14psi. This...