can anyone tell me the difference between the two? i want to install a d3 in my 07 patriot with base system. crutchfield says it doesnt fit. i have seen successful installs using the CHYAH05. but crutchfield says the n4 fits and says to buy the PAC C2R-CHYNA to make it work. really i only ask because the PAC C2R-CHYNA is $70 cheaper including %50 discount on crutchfield. are they the same thing. from what i found they do the same thing but the CHYAH05 is used with the factory amp and the PAC C2R-CHYNA does not.