i have a normal LS flywheel in my crx, a 14lb one ready to go in. i drove my friends LS civic with i/h/e, and a lighter flywheel, it is noticable, nothing HUGE, but its nice to get the rev's up faster tho, and since u are probably using the z6 head, or full engine, ull want that so it gets u into vtec faster, without alot of torque, i say go for it. mine only costed 70 bucks cause i bought it from a friend, should only cost like 100 in a shop.