4003 upgrade kit – makes 4003 into 4002

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4003 upgrade kit – makes 4003 into 4002 from GFB (Go Fast Bits) is a precision-engineered performance turbo component manufactured in Australia to the highest quality standards. GF B products are trusted by enthusiasts and workshop professionals worldwide for reliability, fitment accuracy, and performance gains. Suitable for turbocharged petrol and diesel performance vehicles. Direct fitment or universal application depending on model — refer to GFB's fitment guide for compatibility with your specific vehicle. Show more