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As per the link provided...
"For the racing enthusiast, this is the ultimate upgrade to fully maximize the power output of your N54 engine. The compressor wheel inside each turbocharger is increased in size by 5mm enabling additional boost pressures at higher engine speeds while retaining efficiency. Furthermore, the Dinan twin-turbo upgrades come with upgraded heavy duty wastegate pivots that are significantly more durable than stock. These items combine to create an engine that now produces over 14psi of boost at 6300 RPM and yields a maximum of 444 HP @ 6350 RPM / 450ft-lbs @ 3300 RPM. These larger compressor turbos REQUIRE Dinan Stage 4 performance software, as well as Dinan’s cold air intake, intercooler, and oil cooler to fully regulate the boost increase and deliver a polished product. In addition to the Dinan product, an aftermarket downpipe is also required although not sold by Dinan."
Price wise the web site lists the front turbo as $1499.00 and the rear at the same price.
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