Unlock Dewey:
     Win all circuits on amateur mode.

Unlock Louie:
     Win all circuts on intermediate mode.

Quick start:
     Just as the third light turns on, press A to get a quick start.

Secret car parts:
     Secret  car  parts  are  hidden  on  the  last levels of the four
different  series  (provided  you  won all the races to get the fourth
series)  you cannot advance to the 5th and last series without all car
parts.  They  are  hidden  in  secret  places  so look hard and go off
course.

Parts locations:
     The car pieces can be found in Indianapolis, Malibu, Philadelphia
and  Chicago.  You  can claim the piece even if you don't place in the
race  so  take your time to search each of these raceways and find the
pieces.

     In  Indianapolis,  turn  around  as  you go under the bridges and
you'll find the piece in a corner behind one of the bridges.

     Malibu's  was the hardest to find...in the big boulders along the
oceanfront,  there  is  a  little  tunnel  that takes you to the piece
there.

     Philadelpia's is in the big warehouse room.

     I ran into Chicago's on accident, so it was pretty easy to find.