I am confused, -10 and -30 please help

[mojorider]

I was just ready to order the -20 kit for my 03 996 c2 and now being told you can only get a -10 or -30.

There is a big difference in price 630 vs 1445 but the dealers can not tell me what in fact is different.

Can anyone help?

Also, what is the 10 and 30 like, been told 30 is way to track bias and may not be a very big diff.

Please help.

[GreigM]

-10mm sounds like standard sports suspension. -30mm sounds like GT3 suspension - ask them if this is the difference.