How do you win the first boss race?

Its just like the other races...i recommend upgrading ur car as much as possible, especially for acceleration, because top speed isn't important in canyons.

stay as close to them as possible, but take the outside edge of a corner if possible, it doesn't slow u down as much
and then stay as far away as possible the second time down, again, take the outside edge

It depends,if u are usin' a TEIR 1 car then out race him/her in the city part and u will get an advantage in the canyon.BUT if u r usin' a TEIR 2 car than have him/her close,BUT NOT TO CLOSE or else him/her WILL HAVE THE ADVANTAGE if done corectlley than u will have the advantage and u will also have a better chacne of geting the "pink slip"(Get the bosses car) and u will get an extra $500$ dollars.Please note that this is not the only way,it is 1 of many ways,and this way takes MAJOR SKILL!!!THERE ARE EASIAR WAYS THAN THIS ONE!!!

Use a car with the best accel possible, top speed isn't very useful here except for (spoilers!) wolf's canyon which you can race first if you picked the exotic car as your first. Basically you want high accel, and you want to slow down near the turns with weak walls, and if you pass him you want to block him off and stay ahead of him for an easy win. but if you can't pass him then just stay close to him without falling off.

When you get to the second phase you will need to stay ahead of him until the end or race far enough so that he is falling behind, this is difficult to do against the Bosses though and is best for against or people. when you win you get to pick two slips, two being known, 4 being unknown, go to the cheats section to find out which 2 slips could be the opponents pink slip