84-85 GN Throttle Bodys


This mod helps the HotAir cars even more than it does for the intercooled cars.

The inlet diameter on these parts is more than .300" larger than the exit diameter. (65mm vs 57mm) Plus there is a smaller lip between the two sections and two IAC tubes that protrude into the air stream to further restrict flow.

This mod involves machining 4 to 5 mm from the rear section and removing the lip where the two diameters meet. The IAC tubes are also machined flush with the bore 

The linkage side of the hotair throttle body is a casting boss with a recess in it that will be cut through during the boring procedure. In order to obtain maximum bore diameter the recess is filled with epoxy and a disk is attached.  


The 84-85 Throttle body rework does not involve installing a larger plate.


Hotair TB Service - $125 including priority mail shpg (USA)


48 hour turn-around in most cases

See Order Page for address & more information

Hot Air Porting Services



Port match turbo compressor housing to 62mm TB 

$75 + $10 priority mail shpg to US address

Includes bead blasting comp hsg exterior







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