I'll be keen to see how it plays out. A mate of mine with a Renault Clio RS w172 went through what you are doing now. His cam wasn't big enough (we do sprints and hillcimbs not circuit stuff so much) for quad throttle bodies, so he tried all the different Renault sport iterations of each NA inlet and also some apparently aweosme aftermarket carbon trumpet ones as well. The impact they had on the car was enormous forcing cross the board timing and fuel changes. For the cam he had ( a W182 clio inlet) the Renault sport long runner beat all the aftermarket ones and still had the best top end? Results were sometimes counter intuitive so like you are doing you need to consider everything. He's changing to a W182 head now (same cams) and because they have different inlet port angles/lengths they are going through it all again re intake selection - incidently they've modded the megane 59mm throttle body you showed and taken it out to 60mm with new internals.
Same was true of the exhaust too. The supposed better 4-2-1 extractors weren't as good as the 4-1 that everyone said to get rid of. The calcs said go with 4-1 and they did. On inspection they found that the union of the 4 pipes at the collector didn't have one of those spear head pulse guides things and the mech didn't like the angle at which they arrived into the collector. So they cut the collector open, welded a pulse guide in and made the preferred extractors even better.
Have you seen the tissue paper test of extractors that you do with compressed air? - our mechanic guy demonstrated a bad set of aftermarket extractors versus a good set of OE ones. You place a tissue covering the extractor port of what would be the next cylinder in the firing order ie the one that would pulse down to the collector next. You then give a little burst of compressed air down the extractor port that would fire before it. If on that burst the tissue over the other port gets sucked straight down and flies out the main pipe then collector scavenging/timing is decent and back pressure isn't bad. They did it on some bad extractors and the tissue would fly off into the air in the opposite direction = back pressure at the collector etc etc and other likely problems. Its a non scientific but apparently a very easy way to quickly weed out what is utter crap and what might be designed well enough to consider further. could help