you can remove it in arc.ini here it is
[External compressor:msc]
header = 0
packcmd = MSC c -v -f -wav=1 -raw=1 -bmp=1 -ddsraw=1 -ddsdxt=1 -mp3=1 -bmf=9s -tak=9 -dxt=1 -lzma=hc4,lc8,lp2,pb2,fb273,mc1000 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
i will warn you tho, this can become unstable if you force it with -f switch
@amsal i used -moptimal for assassin creed
its pretty straight technique
add these lines in arc.ini and replace lzt
[External compressor:lzt]
;x64 version ;fast: -32 ;max:-p1 -49 -b200
packcmd = lzt -p2 -49 -b200 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp
unpackcmd = lzt -d $$arcpackedfile$$.tmp $$arcdatafile$$.tmp
datafile = $$arcdatafile$$.tmp
packedfile = $$arcpackedfile$$.tmp