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PowerChip makes one, but I've never heard of anyone that even has one... just under $500. But you'll need to run premium (93 Octane) fuel to make use of it.
http://www.powerchipgroup.com/interact/datasheets/datasheets_two.asp?pid=Vol0103
You can also get cams from a '92-'94 960 and swap them in... a little less low end torque, but you get a lot more in the top end.
Maybe modify your airbox so the thermostatic flap isn't stuck sucking in hot air? Or even route some custom tubing to draw in a little more cold air from the front. Also, maybe have a custom exhaust fabbed up.. something I'll probably be doing myself to mine this summer.
I used to have something from SCT that said they sold an ECU upgrade with the cams... don't know where it is now, or how much they charged.
-Steven
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