Ok, unban him.
Yeah but for years the rule was no mod is allowed except epoxi's mods that you can find on the forums (since then, FB, max and others started some AX friendly mods) and I think some people said it still affects a bit the gameplay (idk if that's true), anyway we've always been punishing anyone who visibly has mods even if they're not supposed to change any performence.
And this rule was probably made to make admins' task easier, since if the handling is barely changed it will be hard to notice, while we quickly notice if a car is not well moded (epoxi's mods can't be noticed by other players if I'm not mistaken). Here, the infernus was lower than usual, which made it visible on first sight it's mods.