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The largest you can open up a stock TB is 52mm (stock is 48mm)
I am currently getting set up to be able to bore TB's to 52mm, add larger throttle blades and bore the shaft holes to accept needle bearings (the stock TB has the steel throttle shaft running in the aluminum TB bores, unbushed, so the shaft wears out the TB holes).
If you look on E bay this service costs about $175 (you provide the throttle body)
I'm planning to charge $125-$150 and should be set up to start in about 2 weeks (hopefully) This will be for TPI and LT1 throttle bodies.
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