Kitchen & Bath Renovation and Repair

Is this a top speed of 2.5 inches for the exhaust catalyst stronger, with better sound quality stronger or unpleasant?

I Greddy Evo2 an escape and asked a sport 2.5-inch stainless steel high-flow high-performance catalytic converter, what effect will this in my car, in terms of quality and performance of Sun? Also the pipes for the Catback is 2.5 inches.

The result will be less restrictive (cons-pressure) in the exhaust system is not robust.