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Luxury meets real performance . REVHIGH | VAITRIX Stage 2  sharpens the BMW 840i with thicker mid-range torque and longer top-end pull—delivering stronger acceleration without compromising comfort. 📊 Dyno: 340 hp → 418 hp 💥 +78 hp ⚡ Quicker city response⚡ Effortless overtakes⚡ Calm, confident high-speed pull A refined performance upgrade, done right. 👉 Enquire now to upgrade your BMW 840i ! —— 📈 Get an Estimated Power Output or Tuning Quote for Your Vehicle Click here:.