![Dinan Free Flow Axle-Back Exhaust | F30 · F31 · F34 328i · F32 · F33 · F36 428i | 2.0L Turbo I4 [N20] Color:Black the R1 is designed to](https://cdn.shopify.com/s/files/1/0635/0032/1015/files/DinanFreeFlowAxle-BackExhaustF30_F31_F34328i_F32_F33_F36428i2.0LTurboI4_N20.png?v=1740331438)
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the R1 is designed to be the last DV upgrade the engine will ever need
4 Nutserts
To this day
There's a reason we don't use metal
thereby preventing hot air from the engine compartment to compromise its effectiveness
Dinan Free Flow Axle-Back Exhaust | F30 · F31 · F34 328i · F32 · F33 · F36 428i | 2.0L Turbo I4 [N20] Color:Black the R1 is designed toDinan engineers designed the BMW 328i 428i exhaust to improve exhaust flow by reducing back pressure. resulting in increased power output and a great sporty sound that is civilized when you want it to be, and pleasantly aggressive under hard acceleration. Like all Dinan exhausts our 328i 428i Free Flow Axle Back Exhaust is engineered to reduce low RPM drone so the cabin of the vehicle is still intimate and not drowned in an excessively loud tone. The
