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Join Date: Jun 2000
Location: SF Bay Area,CA
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first -
Is it a 91-'965' (can be also known as a C2 turbo)? or a converted (turbocharged) 964?

If it is a 965, then you shouldnt need to swap out the bit 'C2' intercooler. You may need to modify the silicon downpipe depending on the outlet sizing that you are going to go with on the GT30R.
You exhaust will not bolt up. Oiling is different.

Most importantly, you should be concerned about fueling and exhaust when upgrading the turbo (and boost) of a stock CIS turbo (965). What boost are you planning to run? (i.e. changing out the wastegate or adding a EBC). There are a few ways of doing this (since there is no electronic fuel injection - there is a NO CHIP) - you could add fuel enrichment, or upgrade the fuel head of the CIS. BTW: since there is inherent lag in the CIS, then only upgrading a with a quick spool turbo, will only affect part of your response. This is why many of us (turbo guys) are converting out our CIS for electronic fueling.

I would highly consider upgrading headers with the turbo. The stock exhaust is not favorable to the bigger turbos.

Speak with Stephen at Imagine Auto. He (and ultimate motorworks) have some nice 'bolt in' solutions for you.
89 930 Turbo Cab.(soon for sale)
Old 05-04-2007, 03:59 PM
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