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I recommend the following based on feedback from others and fitment/quality
RPI, Undercover, Fabworx, eurocharged, MSR, AMS, and fabspeed
All range in different prices but overall you'll have the same performance and quality is great. I'd go for the ones in the $900-1200 range
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*** SOLD *** 2013 BMW M5 | Space Grey | MSR Stage 3 Tune | Catless Downpipes | MSR Intake and Charge Pipes | MSR Exhaust (Prototype) | Vorsteiner Rear Diffuser | RW Carbon Front Lip | RW Carbon Trunk Spoiler| Vorsteiner VS-310 Forged Wheels | Escort 9500CI w/Laser Jammers
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