Your name says you have 550hp, im guessing your car atleast makes that to the flywheel on pump gas and on race gas prob whp. There are plenty of other clutches that would work for you. Esp because your driving your Z on the street I wouldnt suggest a twin disc unless you do some serious racing and making more power all the time. Seeing is your asking about it on the street id suggest getting a more "street friendly" clutch and not a strait racing clutch like you have now.
