I've had experience with the R32 Skyline 4-pot. It's not a problem to fit a 16" rim, the problem is your offset. 40 offset won't clear it. I used a 5mm spacer to give it some breathing space (too damn close if you ask me) on a 17" rim.
Personally I wouldn't go to the R32 route because the oil reservoir inside this caliper is large, it'll affect your braking pedal feel, probably will drop a significant amount. I ended up not using it on my Sylphy because it was hard to modulate the pedal feel and it kinda gave me on-off brakes. I was using stock Nissan Sylphy servo. Unless you plan to swap out your servo as well? Master cylinder / Brake pump / whatever you call it.
Thanks for the feedback, there are a few guys in Thailand running the R32 skyline 4-pot setup, but I have no desire to change my master cylinder, especially because the hydraulic's on my car are linked to the clutch operation also so messing with this could create more issues. I think many just do it to get the 4 pot look on a budget.
I am looking to improve performance and feel (over looks), so thanks to your advise I will forget this idea.
Will probably look at costing out the different Mitsu 2 pot set ups, unless I can find a really good deal on aftermarket or Evo 5+ brembo 4 pots. (@samngcheesan I will PM you nearer the time I am ready to move forward, I am in Thailand but visit KL sometimes)
4 pots might be overkill for what I need though, I guess I am running now about 160 BHP +/- so less that an Evo 3/4 with similar weight. Even if I boost or mod my 4G92 Mivec more I won't be looking for big power much more, the concept of my car is to make it a fun car to drive within the limits of the roads in Thailand, not a power monster (if I had wanted that I would have saved a little more and swapped to a 4G63 Turbo).
New tires and up-rated brake hoses are also on my agenda for this year as well as up-rated hydraulic fluid and up-rated brake pads all round. Used EBC pads in the past in the UK, can anyone recommend what is a good up-rated performance road brake pad popular in Asia?
cheers