I think you'll win something if you use b-spec only The computer driver suck so much, its a wonder they can win any races. My 400R couldn't even pass some 70s nissan car in b-spec mode...
i've taken so many games to the extreme - majority are RPGs where trying to do my best is just a little addiction - never letting any party member die, never run from battles, complete all monster lists 100% (like ToE - no "???" marks anywhere) + lotsa other weird quirks... but developers almost never appreciate hardcore gamers... hell GT3 should have had 1 super secret exclusive car even for the 100% that u couldn't get/see any other way - so many ppl out there who just can't be bothered with that TT-10 for practically nothing new besides 100%