| I snapped a couple photos last night, measuring the I.D of my inlet pipes. Both the INDUCER section and the induction piping connection end. I am not sure if these are the same as some other MS inlet pipes since mine had some custom work done to them. DRIVER SIDE
DRIVER SIDE, INDUCER (meets compressor INLET)
~53.5mm"
 DRIVER SIDE, INLET (meets induction piping) ~58.5mm
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PASSENGER SIDE SIDE
PASSENGER SIDE, INDUCER (meets compressor INLET) ~53.5mm  PASSENGER SIDE, INLET (meets induction piping) ~53.5mm 
As you can see, these are very similar in sizes, he also power-honed the insides of the pipes so they would have a much smoother surface. I highly doubt that these came this similar in sizes from one another by accident :) My GT28RS turbochargers have an INDUCER spec of 47.2mm.. These INLET pipes taper down in addition to the custom work done on the compressor housings have the taper of ~7^ which meet the 47.2mm specs of the INDUCER wheel. Theoretically, it will speed of air velocity.. Similar to SZ's expansion pipes, except these are in the opposite direction of flow... They conical UP from the turbine INDUCER to the 3" exhaust piping. Should have very good flow dynamics.
As for my induction piping.. I plan on using some mandrel bends in 3" from the MAF sensor and then do some work to taper it down to meet the INLET pipes.
My induction setup is a little different.. I ditched all the piping that goes under the headlights to the center. I have a GReddy 3row FMIC and have two MAF sensors/filters, under each headlight. I will tell you that I was amazed how much AIR that turbos pull in. A long time ago when I got my GT28R turbo build on the road.. I was excited about going to the track.. it was un-tuned and I JUST got the motor back in. I headed to the track with no front bumper because I did not have my induction pipes made yet. I had to use some gallon ice cream pails to keep the "ram-air" effect from screwing up my MAF readings.. I have a video of me at the burnout box and those buckets were being COMPLETELY suctioned to the filters... and I STILL managed to pull a 12.4@ 117 with a horrible 2.4 60ft. and my 200lb speaker box etc inside, untuned. I was truly amazed how much air that turbos will pull in, this was when I had STOCK inlet pipes.. upgrading this part should do some serious gains, especially in boost response.
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~~~ Sig starts below ~~~
=================================================================NO, This picture is not photoshopped.
AIM:Shawn300zxTT "-Any closeups on the nuts? - zboost(tx) 19:17:53 08/08/05
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teambushido(San Diego, CA) 19:24:51 12/11/04 -1991 Stage _ TT 5spd (Upgraded to hell and back)
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Mike Smith INLET piping diameters (Inducer and inlet ends) - 
