0. run openIV, turn edit mode and bo to localizations:
1. replace in: x64w.rpf\dlcpacks\mphipster\dlc.rpf\x64\levels\gta5\vehicles\mphipstervehicles.rpf\ files:
glendale_hi.yft, glendale.yft and glendale.rpf
2. replace in: x64w.rpf\dlcpacks\mphipster\dlc.rpf\common\data\ file:
handling.meta
3. replace in: update\update.rpf\dlc_patch\mphipster\common\data\levels\gta5\ file:
vehicles.meta

In vehicles.meta You can only change this lines:
<wheelScale value="0.230000" />
<wheelScaleRear value="0.230000" />

You can choose the black leather edition from folder: black_leather_edition

Changelog:
30.09.2015 v1.2
- added black leather version
- deleted spec map for matted materials
- added dials
- chassis now have bullets effect
- chromes perfect
- added correct wheel broke effect
- minor changes
old v1.1:
- new leather and plastic texture
- new better chromes