The 450R swingarm bolts right in place. You have to transfer all the parts (linkage, shock, bearing carrier, brake) from your EX swinger into the 450R swingarm. It is about 1.5" longer than the stock EX swingarm. The only things that you will need are a longer chain and chain slider for a 450R. Like I said, everything else will transfer over without issues.
It basically adds more stability to the quad and helps to keep the front end down.
99 416EX
12.5:1, XR400R cam, Ported, FMF Powerbomb header/White Bros. E-Series Slip-on, Hinson clutch, KN/open lid, 40mm FCR tuned for E85, KFX450R front shocks, Works Ultracross Rear.
08 KFX450R
Pro Circuit TI-4 Full system, KN intake, PC V, Hotcams Stg 2
10 Yamaha WR250R
Street legal dirt bike
99 Chevrolet Camaro Z28 M6
H/C/I/N2O All motor = 430rwhp/403rwtq 150shot = 591rwhp/649rwtq 11.4 @ 128 on regular street tires 26mpg
93 Eagle Talon TSI AWD 5spd
Evo3 16, 272 cams, Evo 8 Rods/Pistons, 560cc injectors, 2G MAF, DSMLink @ 17 PSI