i've got a fidanza 11lb flywheel, and i love it. faster revs, and i love the way my car decelerates when i let off the gas now. it's a whole different animal.
In the old days when I built my Twin Turbo 4V Toyota V8 you couldn't buy a flywheel to suit so I got 2 x Auto Flex plates machined the ring gear off one then welded them together and bolted a Steel Friction surface on for the Clutch.
It worked perfectly was light weight and DIDN'T generate strange magnetic fields nor did it require the motor's internal balance to be changed as it was 0 balanced just like our 7M's are!
I love my UR flywheel.
Also check out MX83*GX71(<i think 71...) on eBay.
Gordon's an excellent guy to deal with, knows his shit, and has some billet steel flywheels for like $300 iirc.
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