I have had Dinan tuning in my E63 and my E70 X5. No reliability issues, excellent sound and performance but expect to pay for it. On my new F13 M6 I have an Akrapovic exhaust because I wanted titanium and I knew Steve would not do it but I am holding out for his cold air intake and tuning. His parts meet or exceed every BMW factory part. On an $8000 Akra exhaust one of the clamps was defective and they had to overnight a second one. I have never had a faulty Dinan part, ever. I hope this helps. BTW the E63 exhaust on my previous M6 was amazing in sound but not a huge gain in performance.
Noushy
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2019 BMW X5 50i Mineral White/Tartufo all options including M Sport
2022 Porsche 911 C4S Silver/Brown
2023 BMW iX M60 Black Sapphire/Amido, Titanium Bronze trim/22
2023 Audi RS6 Avant Daytona Gray/Black
2024 BMW X5M Comp Brooklyn Gray/Taruma Brown, Titanium Exhaust on order
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