you got the power. as for fitment, they should fit but you would be happier with a lift to give that extra room for articulation. spacers im not so sure. i will say when i put 27 in mudlights (on stock rims) on my teryx, the front tires rubbed the tie rod end. so i put spacers. but like i said, thats a teryx. when i bought my brute, it already had spacers and lift on it. and i run 28 Mudzillas and its a tight fit. also my BF is a IRS not SRA