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guess that gt3 engines, sharing most of the parts with the street unit, are cheaper and have a longer lifespan before the rebuild, while GTE engines have more expensive racing parts and a shorter lifespan.
Recall a 2009 or 2010 R8 that made both ring 24H and spa 24H with the same engine.
Guess suspensions and gearbox too are more expensive for GTLM car. GT3 gearbox is quite a standardized part, having fixed ratios
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