Yeah the 60' killing your time. I have not used the NT05 but did run the 555r on stock wheel with a lot of heat in them was cutting 1.60 60' running high 10s at 585 rwhp.
If you want to run 20" wheels try the 555R and heat the hell out of them. I have cut low as 1.57 60' with them.
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Best @ 586/525 = 10.41 @ 133
AS OF 12/13/14>633 RWHP =10.22@135
AS OF 1/31/15 @ 633 RWHP=10.16@135
AS OF 1/29/16 @ 633 RWHP=10.10@136
TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF
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