very hard to squeeze any measurable gains with the just a rear section
don't read too much into manufacturers stated gains....
2016 F80 M3 AW | Cloth/Leather: Carbonstructure Anthracite/Black Seats | CF trim | M-DCT |Adaptive M suspension | 19" Silver 437M wheels | CF Roof | Pics/Mods
Sold: 2011.5 E90 M3 AW l Black Novillo Leather | Carbon Fiber Leather Trim | ZCP | ZP2 | M-DCT | Navigation | Moonroof | 6FL l Pics/Mods
Retired: 2008 535i l AW l Black Dakota Leather l Bamboo Anthracite l ZPP l ZSP l 6FL