lmao uk section and only one UK reply :P
The other day I drove past an mk4 supra and we waved, all jdm car guys in the area and I wave at each other. Unlike the US, in UK we are a tiny community so makes sense to acknowledge each other and get excited if we ever see another :P
lmao we must be forged from the same stone, I'm also considering going the alpina style route for my supra, that was the initial plan actually as I thought it would be 5x120. the HRE logo also resembles alpina lol before reading your post the first thing I thought when I saw the wheels was alpina :D
You'll get limp mode without a tune lol
You need a US spec aftermarket downpipe with a US spec downpipe.
there is an opf delete plug-in in from a company called leib or something, they have it listed for g29 z4. not much info on forums on it but seems to do the trick.
For the TOMEI exhaust you need American specced downpipe, also in EU we have opf so the exhaust will cause CEL. but I found a potential solution to this and now waiting to get my tomei exhaust next month. (pozdrowienie z pajeczna :P)