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Sorry to hear OP, I'm not very familiar with the n54 but my experience tells me modded turbo cars are just not as reliable as their n/a counterparts or untuned motors. Have you considered replacing the motor but keeping her stock, and only keeping the cooling related modifications? Truth is even in stock form the n54 will hold its own on the track. You really don't need the extra hp. As long as overheating isn't an issue, only mods I'd really focus on are tires, brakes and suspension.
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