for a track with any dirt at all, go 100% dirt parts

using nsx 3 for all non-mudpit dirt tracks works okay while you're working on the other dirt cars

see list below for class B upgrades

if you just want to get 10 skill, do this one and only do custom 100-lap Docks races, ideally 1v1

do one of these first, and use it for all six of these tracks

i've had mixed results with both NSX 4 and NSX 5 for this track, ymmv

do one of these first, and use it for all six of these tracks

high-rs drivers use the lfa here, but the lambo seems more consistent? YMMV

do this second, use it for these two tracks & convict

low priority, lfa will do okay here

!!!always buy engine remap 3 regardless of what turbo you use!!!

torntools will highlight parts that take the same slot, always buy the most expensive one

(with the exception of turbo 2 on some cars)

class B upgrades to put on your cosworth before you hit class A

these are all the upgrades that are available in class B that are still best-in-slot once you reach class A

Adjustable Rear Spoiler

Competition Racing Brake Pads

Ported and Polished Head

Full Exhaust System

Air Forced Engine Cooling

Grooved & Drilled Brake Discs

Competition Polished Throttle Body

Stainless Steel 4-1 Manifold

Air Cooling Ducts for Brakes

Fast Road Brake Fluid

Competition racing Fuel Pump

Braided Brake Hoses

Front Mounted Intercooler

Brake balance Bias Control

Bored Out Engine & Forged Pistons

weight reduction

Polyeurathane Bushes Front

everything except the one in class A

Polyeurathane Bushes Rear

^ maybe hold off on this if you're using the cosworth for all tracks in class B

Upper Front Strut Brace

Competition Race Clutch

Lower Front Strut Brace

Ultra-Light Flywheel

Adjustable Rear Control Arms

Front Adjustable Tie Rods

buy all of those while you're in class B, and then once you reach class A buy the rest of the best-in-slot things

congrats you now have the best cosworth with no wasted points and not crippling yourself in class B