Just install an RB25 flywheel and clutch. You can get a lighter flywheel the the 18lb one that comes in the competition setup for around the same price. I paid $400 for a 14lb XTD flywheel and a stage 3 competition clutch that's rated for 500wtq on a skyline.
Also the d21 flywheel you're looking at will weigh at minimum 23lbs. The white bunny setup is rated for 400whp. The oe replacement special WILL slip past 250whp
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