Quote:
Originally Posted by jwasbury
...seems the factory thought it was important, right?
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Sometimes yes, sometimes no.
The factory 930-S engines with the larger Ruf-like intercooler usually had no diverter valve.
I haven't seen diverter valves or pop-off valves on their later Turbo racecars, either -- none on the GT2 Evos.
Easiest would be to install the 965 CIS elbow which has a 25mm port for a diverter valve, use a 993T diverter valve, then weld a 25mm tube on the outlet side of your intercooler.