Probably the most noticeable increase will be engine noise, not power. Both of your suggested upgrades have a tendency to increase the intake sounds, to the point that you can start to hear them in the cab under certain circumstances. Some, like the throttle body spacer, also have a propensity to make a whistling sound under load. That can get old fast.NDJollyMon said:Any thoughts? I'm hearing the increase in power is well worth it.