The BMW S63 W.4 Turbochargers are complete, bolt on replacements for the stock turbochargers. There are no core charges with these turbos. No need to send in your stock turbos to get modified while your car sits in pieces waiting for the turbos to get back. Simply install the Weistec W.4 Turbochargers when you receive them. All necessary hardware is included. New turbo inlet pipes that mate up to the factory airboxes (or any bolt on aftermarket intake), and new charge pipes with integrated methanol injection ports that connect the turbos to the factory intercoolers come standard with the S63 W.4 Turbochargers. A pair of Weistec 304SS downpipes are also included to connect the turbos to the rest of the exhaust without any cutting or welding as downpipes that are for the stock turbos will no longer fit the vehicle. Stainless braided oil and coolant lines are included with custom CNC machined and anodized fittings. It truely is a bolt on turbo upgrade that completely replaces the factory turbochargers. Even the factory engine cover still fits over the turbos.
Weistec offer three different Garrett turbo size options to choose from: GTX3071R Gen II, GTX3076R Gen II, GTX3576R Gen II, and GTX3582R Gen II. This gives choices that range from reasonable response and mid range, to all out monster top end power!