And what do you base this "fact" that it shortens the lifespan on? Got the datasheet for the transistors used in the SMEC? How about a graph showing the temperatures reached during operation without airflow?
Rule of thumb of the trade, I work in Electronic Engineering, 7 years experiance. BUT, I never say I am not wrong. It's a better safe than sorry scenario on my judgement. The Chryco engineers that made alot more money than I do also designed the SMEC to have air pulled through the SMEC for a reason.
However I think most people that get rid of the factory air cleaner assembly leave the SMEC open on both ends, so it gets some cooling from air finding it's way through the front end.
I ran without any air cooling to the SMEC for a summer and I had it crap out on me, because of overheating leading to failed components? I can't say for certain. But I wasn't going to risk it again!
If there wasn't so much gross potting compound, I could get read the part numbers on components, and get hold of a datasheet for the components, yes.
This was my solution to the question and doubt. Turbo I throttle body/intake piece, bolt holes fit a standard computer fan and I just wired it into the radiator fan relay and to ground. I turned the fan upside down, looks nicer.