Zillas.
I seen your other post about a tunner, if your looking for performance, stick with light tires and light 12 inch wheels, ie stock.
I have 27x9 cst anclas front and rear on my ruby, they dont rob much power at all and work good on the IRS atv. IDK if I'd like the skinny rears on a SRA tho, they dig to the bottom fast, which is fine when you have 14 inches of clearance on a irs but not good with a low sra.
PS I dont know of any tunners/programmers for the 520.