CIS can be tuned. Everyone has just forgotten how in the modern world.
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Sure Chris, anything can be tuned but the CIS injection on the 3.0 911's is only the start of the problems. You also have very mild cams to work with CIS, low ( by todays standard ) C/R, so so intake runners with a crappy airbox setup and a big need for lots of oil cooler to keep it alive. The T bar suspension will work fine but is a pain in the ass to work with and bars are mucho more $$ than a 2.5" coil over spring. I love air cooled 911's, but unless you are in a class where the changes allowed help all the pitfalls, you are just riding around in a cool car that makes cool sounds....