I am considering ordering a coupe but I am still trying to decide what drivetrain I'm going to use. I was considering buying a salvaged 2015 mustang gt. I am still a little confused about the IRS equipment needed from the Mustang. Are the only parts used the gear section, spindles and brakes? So I'm assuming that the rest of the parts come from factory five (rear suspension kit listed for $2499). I apologize if this has been answered in the forum before but I can't find it anywhere. Thanks.