I have a 98 gsr & I need a convertor. I ve seen a few places that sells the magnaflow high flow cat. Place I found wants like 458 bucks. I have twin 9 mo old sons so I cant afford to spend 500-1000 bucks for a cat convert. I have a ws2 cat back stock header. Trying to see where did everyone buy their high flow cats & what it cost. Someone told me look for magnaflow direct fit 9000 series. The one I found at autoparts warehouse they wanted like 458. Also does the high flow cat improve flow over the oem cat?

Any suggestions would be greatly appreciated