My '03 Dodge HO Cummins Diesel is quieter than my '97 Dodge gas V10 was. Very little noise now on 20M with my 706MK2g. When I first got it a couple weeks ago I walked around with a handheld CB and there was a lot of computer or injector hash when the engine ran, but final installation with the 706MK2g is quiet on 20M. Haven't checked 10M or other bands. Jerry W4UK