Fender flares by themselves don't provide anything. If you need to run a big ass tire and are allowed to by your rules, then I guess you'd need a flare to cover it. Tires are the benefit. Flares are a side effect. However, we are talking about a very wide tire. We are running 235-245 40-17" tires on one of the racecars, and I just flared the stock sheetmetal a little by hand. If you slammed the car on tires this big, you would probably need to do some flares, but you'd also be having to basically cut out the whole fender area and apron. Not to mention serious correction of the suspension geometry and a lot of fabrication. Basically, if you need flares, the flares themselves are probably the least of your worries
andris