2001 Lexus IS300 Factory Amplifier

I'm currently working on a 2001 IS300, I know th eamp is above the pass. kick, and I have to rewire I was wondering besides that if I need to do any more wiring or replacing cause my friend said I can use the TWH-14 or TWH-17 amp harness , and my other friend said cannot but also have to rewire the rear speakers cause something about being self amplified, so might need to replace... can some one help I'm not too familar with these cars and even fellow installers can seem to give me a straight answer... thank you...Thats SIK!!!!

+12V DC Battery(Constant)	Blue / YELLOW		Radio 1	20 Amp	Relay box 1 on right rear of engine compartment
Switched Accessory	Gray	Also goes to the amplifier	Radio 2	10 Amp	Junction box behind lower left end of dash
Ground	Brown
Power Antenna	Black
Remote Turn On(output)	WHITE/ blue
Mute	Blue	Blue mute applies to woofer & stereo amplifier. Navigation mute is RED / blue from amplifier pin 5.
Left Front +	White	Line level output
Left Front -	Red	Line level output
Right Front +	Green	Line level output
Right Front -	Black	Line level output

AMPLIFIER OUTPUTS

Wire Function	Color	Note	Fuse #	Size	Location
12V DC Battery	Blue / YELLOW		Radio 1	20 Amp	Relay box 1 on right rear of engine compartment
Remote Turn On (input)	WHITE/ blue
Left Front Tweeter +	Pink
Left Front Tweeter -	Violet
Right Front Tweeter +	Light green
Right Front Tweeter -	Blue
Left Rear Mid +	Black	Passes thru telephone transceiver & speaker relay
Left Rear Mid -	Yellow	Passes thru telephone transceiver & speaker relay
Right Rear Mid +	Red
Right Rear Mid -	White
Subwoofer 1 +	BLACK/ white	Left rear woofer
Subwoofer 1 -	Yellow/red	Left rear woofer
Subwoofer 2 +	RED / white	Right rear woofer
Subwoofer 2 -	WHITE/ blue	Right rear woofer

AT SPEAKERS

Wire Function	Color	Note
Left Front Mid +	Yellow
Left Front Mid -	Black
Right Front Mid +	Red
Right Front Mid -	White