Before the bumper conversion. FBO 340i b58 with BM3 stage 2 91 tune vs 2015 Camaro SS FBO with dyno tune. Obviously let off at the end. The B58 is a powerhouse Please allow 1-2 weeks for delivery This is a trade-in listing, which requires you to send us your stock B58 turbo to be upgraded. Please contact us for delivery address. See good deals, great deals and more on a Used 2017 BMW 340i. Search from 124 Used BMW 340i cars for sale, including a 2017 BMW 340i Sedan and a Certified 2017 BMW 340i Sedan.