Engine cover I guess? If it is the MD variant, then you will see the word MIVEC MD on the engine cover. But as for RS, I'm not so sure on how to differentiate it in terms of exterior look. I heard some calls the RS as blacktop so, I think the engine valve cover for the RS version is black.
Spec wise in terms of hp output, 4G92 MIVEC will be the highest at 170hp stock. Do keep in mind that people said that is the output on crank. If on wheel, I think it is around 140 plus hp.
The hp figure here is just a rough estimation, not the exact figure. But it is more or less around that figure.
4G91 DOHC =115hp.
4G92 DOHC = 140hp
4G93 SOHC = 118hp
4G93 DOHC = 140hp
4G61 NA = 124hp
4G67 = 135hp
For 4G63, the figures are rather different depending on which version you are getting. For example, the 4G63T in earliest Galant VR-4 produces around 205hp while the one in Lancer Evolution III produces around 270hp.
If his car is all stock from the beginning, even 4G92 MIVEC might be a bit much for his stock suspension and brakes to handle it.
Exactly where I learn my stuff. Also learned from using the search button in zth. Digging into old post between 2005-2010.
And you rejected the offer?