The 11" clutch is more of a race clutch. The disk materials are more aggressive and it has more clamp loads.
The 12" is a street friendly clutch. The disk materials are designed to be more street friendly.
The Twin and triple disk clutches have very good street manners as well.
Yes, 12" Level 1 or 2 would be my recommendation. A 28 lb flywheel would be the smoothest street driving weight flywheel. The 18lb will free up a little power and let it rev a bit faster but takes a little more rpm's to get the car moving.
How are the level 1 (street) clutches on smoothness? I hate chatter and excessively grabby clutches. While I have fun with my car, I spend most of my time in the car driving in a relatively normal manner. How much more stiff of a pedal can expect from stock to say a level 1 12"?
I have a Monster Level 3. It chattered pretty bad when it first went in. After 1000 mi, it still squeaks on normal starts. It can take the abuse, though.
Edit: My level 3's pedal feel is 10-20% heavier than the stocker. Not a big difference to me, but could be an issue for some. I got used to it in a day or two.
I don't ever plan to do more than bolt-ons on my LS2, any reason for the Level 2 or would the Level 1 be sufficient? I know what the HP ratings say, but is there any reason the Level 1 would be a bad choice?
Just ordered a 12" stage 2... slave cyl crapped out last week, car needs a clutch anyway so figured it was fate. I was going to go with the LS7, but I think I'll be happier with this. Can't wait!
Thank you uncle sam and direct-deposit tax returns!