Hey I'm just arguing my point. There is a problem with going to light on a flywheel. If you do a google search for too light flywheel or something like that you'll find a hundred websites talking about how it affects drivability in part open throttle or cruising speeds. Yea if it's a wide open throttle race engine or a turbo'd engine that you want to spool up fast, it's not gonna matter, but if it's a daily driver it could be a negative affect. Here's some websites that will explain what im saying. www.dragsport.com/issue/5/tech.shtm, www.racetep.com/flywheel.html, members.aol.com/AJahed/mods.html, and if you lok up the jun chromoly flywheel or the spoon chromoly flywheel it will say that their flywheels are perfect for free revving without losing any bottom end torque! And me saying that aluminum is prone to warpage... well it is. You can google search that too. Aluminum is always prone to warpage when it is overheated and if alot of these guys are slipping their clutch alot when launching they are heating it up tremedously every launch. Thats why alot of websites say to use an organic clutch disc with an aluminum flywheel, because the discs operate at lower temps compared to other race clutches which could get your flywheel too hot. I just figured that if they can warp from heat maybe they could warp from being tightened down crooked. Like if you tighten a skateboard truck on one side and then try to force the other bolts through on the other side and tighten them, it'll crack the baseplate. Or like when you put your aluminum head on and the manual tells you the torque sequence and says it is futile to be torqued down in the right sequence. Don't get me wrong, really lightweight aluminum flywheels are really good for road race cars and wide open throttle cars and turbos. But do you guys all see how much higher you have to rev the car to not stall it when letting the clutch out in first, with a lightened flywheel right? Thats kind of showing you the loss of torque you have in your lower rpm's. It was just a suggestion and this guy attacks me and tells me, pretty much, I'm an idiot....Im not trying to become a part of this forum to argue with people anyways. I was just trying to help a guy out with the information that I collected for myself when I bought my first spoon flywheel. I don't go off of what my friends say and what I read on these forums. I go off of what the research and development departments of these major aftermarket companies say. As for the dyno plots I'm still trying to find them and i'll post a link when I do. I never said you will lose horsepower!!! I said you will lose bottom end or off the line torque or whatever you want to call it. I'm just quoting spoon. Sorry guys!