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			Interesting project.  I am not sure why you would choose the Boxster as a chassis though.  For a race car it's pretty heavy and the ECU/Alarm/ immobilizer will all have to be gutted and replaced with a custom engine mgmt like Motronic.  No way the Porsche ECU will get friendly with a turbo Wankel.  I'd guess the trans and mounts are the least of your worries.  Why not use a nice light RX7 chassis or build a tube frame around your power plant?  Any way you go it will turn into a big ol' science experiment.
		 
				__________________2009 Cayman 2.9L PDK (with a few tweaks)
 PCA-GPX Chief Driving Instructor-Ret.
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