From the BMW 340i and Audi S4 to the Genesis G70 3.3T and Infiniti Q50 Red Sport 400, these used sport sedans respond quickly to mild ECU tunes. With turbocharged engines and strong aftermarket ...

We tuned the f30 340i with mhd to see how it stacks up against bm3. From flashing speed to power delivery and real-world driving feel, this video covers everything you need to know before choosing ...