With a few simple, "inexpensive" mods, you already have a Carrera killer. Now a GT3 or TT killer, thats a whole different game if you ask me. For that you need a supercharger or turbo kit, at least on the straights

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The first South American modded reptile ~ 350HP - 4.4 sec 0-60 and 12.7 sec 1/4 mile. But looking for extra 100 HP!