Well, I only got sympathy for you as well as me myself. We know
that 6 gear-ed cars pickup are sure to win 5 gears. But thats the
way the game is programmed. Be prepared to be challenged in any
sort of fashion.
Well, all I can tell you, that GC8 is a fine car in V3. They tuned
the car up quite a bit already. Pretty good grip and acceleration.
You should consider converting it since you played it so far
already. The essence to keep improving is to use a single car and
concentrate on it. Unless you are so darn pro player, then this
doesn't apply to you.
Evo5 will definitely lose to the likes of the AE86 on Akina.
Happogahara is another map the 86 is pretty good at with that
strong 4th gear it has. (Mecha Tune only) Other than that, I don't
see where else you can lose with the Evo5. Its a pretty high rated
car in the game.