I am offering this service to the Z32 community as an affordable alternative to the other TB options available for our cars. These are modified stock TB's so they bolt on with no modifications required except for port matching your upper plenum (a requirement with any upgrade).
I will perform the modification to your TBs so no need to worry about getting a higher mileage pair or if you have powdercoated/chromed/polished TBs etc. What you send to me is what you will have returned with the larger bore.
I am offering this service for $180 including return shipping (48 state). This includes CNC boring the housings and turning new throttle plates with the correct 7* seating angle as well as milling the throttle shaft.If you would like your cracking spring spacers replaced I offer CNC machined spacers in black Delrin for $25 per set. If purchased at the time of TB modification I will add these for $20. I can aslo machine 58mm TBs to 61mm for $180 with return shipping.
Flow bench results from a SuperFlow 600 @ 28 in/H20
350.62 CFM = Stock 50mm INCREASE
468.28 CFM = CNCd 54mm (33.5%) 484.16 CFM = 58mm (38%) 534.26 CFM = Stanza 60mm (52.4%) 566.98 CFM = 58mm to 61mm (61.7%) Feel free to contact me by phone or email with any questions. I'd like to receive all orders through email for easy record keeping. Robert Bastian
(520) 270-1699
azride@gmail.com
Thank you.
Video from inside the Haas ST10 I use to machine the throttle bodies, machining linkage spacers.
GoPro inside Haas ST10 
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CNC throttle body machining - 
