I have had a Kayaba metal single on my car for pretty much its whole life. Its basically a uprated Nissan pressure plate with a 3-puck copper clutch disc. I am going to replace it this time around, but it still has life left in it, and I have been running it for probably 40-50k miles. It would probably make it another 30k easily. Cusco makes a "metal single" clutch that is essentially the exact same thing, and I have recommended it time and time again.
Oh, but it doesnt feel stock at all. Its a lot like the clutch feel of a diesel F350 super duty. It will damn near take your leg off in traffic.
JUN makes a chromoly flywheel for the CA, as does Cusco. Here is the JUN one:
http://perfectrun.jp/src/detail.php?pid ... []=sct_602
Although right now you get absolutely raped by the exchange rate. I have seen it as low as $300 even.
EDIT: Here is the Cusco clutch disc. Found it on RHDJapan.
http://www.rhdjapan.com/cusco-metal-sin ... disc-62274