IMO that would be a real waste of time. The AFM on an NA is already a lot closer to the engine than on a Turbo, so moving it any closer has very little potential for improvement. But you will be placing the AFM directly over the exhaust, which is not a smart place to put it.

Since the TB's cross-sectional area is fixed, the only thing that can effect velocity is airflow. Velocity at the TB will only be affected if you stick something in front of it that affects airflow. Relocating the AFM is very unlikely to do that since it's already in the system.

Yeah, I don't expect to notice much, if anything. I just figured it was worth noticing if there was any change in throttle response by having it closer; I don't expect any change in power, torque, or top end.

I'm using "velocity" in the sense that that is referred to when people speak of the air building momentum to assist in low-end torque -- the advantage of long runners over short runners and such. I was worried if I put an obstruction like the AFM too close to the engine it would start to interfere since there seems to be some line of thinking engineers use that causes them to almost always put the AFM/MAF as close to the start of the line as possible.

At any rate, the reason for it all is I've been building an entirely new intake snorkle from the TB forward so I can properly locate and box a cold air intake and get the nice tone of an all-metal intake to go with the new SP2 exhaust. I figured it would be worth messing with a couple things while I'm at it.

I am running a S5 T2 flow meter on my S4 t2 car,i placed the flow meter at 12 inches off the TB plates(third gen upper and tb) plus tuned the flow meter with the e-manage and it runs great,i didnt have a problem with my AFR at all but im running 1000.cc secondaries 550 primaries on pararel fuel system on a HYBRID TO4E,now before the change i was running a vented BOV and the car uses to backfired now with the BOV right at the turbo it wont backfire anymore,I am very pleased with the results,about the safety switch in the S4 MAF heres what i did,back in the late 90s GM cars came with a oil pressure actived fuel pump(something like that) The fuel pump only runs when a sensor located at the block or sending unit sees oil pressure then a relay will activated the fuel pump so my brother installed a similar system on my car