Ray,

In general (until a change is made, which is likely to come), the current (I just checked) NAMBA approved motors for P-Ltd Cat are

Brand Model Description
AquaCraft AQUG7000 L36/56 7.2-18V – 6 pole brushless
AQUG7001 36-56-2030 – 6 pole brushless
AQUG7002 36-56-1800 – 6 pole brushless
Himax HB3630 1500 brushless – 6 pole brushless
ProBoat PRB3310 A3630-1500 – 6 pole brushless
PRB4017 A3630-1800 – 6 pole brushless
DYNM3835 A3630-1500kv – 6 pole brushless,
water cooled, marine motor
DYNM3830 A3630-1800kv – 6 pole brushless,
water cooled, marine motor
iii) In addition, the CD has the discretion to allow the following:
(a) An aftermarket motor that is a re-labeled and exact copy of any
approved motor.
(b) Any generational change of an approved motor, or a motor that
is used in a Ready To Run (RTR) offering from a manufacturer
that produces over 100 units of said offering, as long as there is
no more than a 5% increase in any of the following
manufacturers specifications as compared to any single
approved motor: Kv, maximum constant amperage rating,
mass, and MSRP.

The class allows up to 10Kmah with no cell (up to 4 max) over 4.23V

Length limit is 34.0000 inches.

The current record is 67.77mph with my Drifter / Aq2030 / Turnigy 120 / Dinogy 3700's 4S2P / Snowman El Kabongo prop Several un backed-up runs over 70.xx mph btw

If you want to do "SAW runs" with the DF cat, the 2030 with the right prop could be the ticket although Ray P. and company in Az are getting their P-Ltd Cat heat racers going max fast with 1500KV and bigger props. The CC ESC is always a good choice