Above photo is the 944 turbo kit, the 944 NA and the 944S kit are similar.

Here is a low-dollar item that can genuinely help your car to start, run and look better. This kit is fairly easy to install (about an 1.5 hours).  Included in the kit are:

• O-rings to replace the throttle body shaft seals. These seals are important because they prevent vacuum leaks that can alter the smooth engine idle.  A secondary TPS o-ring, as well as a throttle body-to-intake flange o-ring and an o-ring for the brass air valve are also included.  
• Stainless steel fasteners to replace the old ones. These fasteners are marine quality and the best looking fastener that can be found. There are hex cap screws for throttle body mounting, hex cap screws for TPS mounting and new stainless nut and stainless, serrated washer for the throttle cable cam. Also included are specially machined stainless steel screws for securing the throttle plate. All of these fasteners look good and stand up well to corrosion.  The TPS screws provided are hex socket head (rather than the OEM Phillips).

• The kit includes 7 pages of step-by-step instructions with over 20 black-and-white photos to show exactly how every part of the throttle body is disassembled, inspected and resealed. 

  Special note; these o-rings are NOT original Porsche parts. All but the shaft O-rings are identical in size, shape and material. The shaft o-rings are replacements for Porsche's wiper seals. These o-rings were selected and tested carefully to provide a very good seal (up to approx 25 lbs per sq in.) without presenting significant drag on the rotation of the shaft.   

  This kit is only for the 944 NA; a 944 turbo and the 944S version is also available for the same price. Below are a few of the photos used in the instructions: