Well BMW is clearly supposed to be more about a exhilarating engine sound experience than fuel economy.
Originally Posted by justinnum1
Offers 80% of the performance of the N54 and gets 35mpg on the highway. Not everything is about engine sound.
2007 E90 AW 323i Step | Lowered 1.25"/1" | BMW Performance Exhaust | PBX | Debadged | Scangauge II | Style 162 18" & 161 17" wheels & rear 15mm spacers