FF, Imho I don't see the need for the SP if the car won't see any off road use. $4K can go into a lot of other upgrades such as increasing HP/TQ. This is where my $4K savings will eventually be spent to get that little performance edge on the other Z's and even the stock Nismo's 
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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