i had to buy an upsizer pipe to run a 2 inch pipe off the factory size and the outlet is 4 or 5 inch if you want exact i can get measurements tomorow morning i like the rims to i just gota touch up a few areas the tire place scratched up on the rims when they put the tires on. and i need to get some different lug nuts. it doesnt look right with the factory lugs