With its tall cabin, we expected highway wind noise to be an issue with the SX4, though we were pleasantly surprised to find those expectations without merit. In fact, the 2007 Suzuki SX4 is remarkably quiet for a car in its price range and class. Road and tire noise can be consistently heard, but it's not intrusive enough to be bothersome or to require raising your voice for normal conversation. The only borderline offender is the four-cylinder engine that, at 80 mph in fifth gear, is humming along at 4,000 rpm. However, even then the engine is muted and not considered a significant issue..