Originally Posted by
UK.hardcore
A shorter arm normally reduces grip due to different roll caracteristics.
But when you narrow the rear end you will get a car that doesn't want to rotate around it's front end as much, basicly making it more grippy.
So it counteracts each other.
Ok cool, so potentially keeping the s4 arm instead of the Yz-2 arm, but using the 5mm or 4.3mm hex on the rear may be a useful thing to test!