i have the JWT flywheel, JWT clutch and stillen under driven pulley... pulley was installed first. Big difference in responsiveness of throttle with flywheel... engine now slows quickly enough on up shifts that I can shift very fast without being at too high an rpm on up shift... sorry, can't tell you if there is a difference going from lw clutch/flywheel to same + UD pulley... did it in reverse order, but honestly I have to guess that the UD pulley made very little difference... i did the UD pulley more for the HP gain... more details in my journal
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