I got it installed this weekend and there is no thump noise or any other problems. Thanks for the help.

 

well i just got done putting a sub/amp in my 94 with the mach 460 and i do get that pop on start up and sometimes when turning it off and the first time it did it i was like sh** what was that but it doesnt really bother me that much unless it is going to hurt something but once on the car is loud as hell now