Trying to find an exhaust to fit my corolla

Hi everyone this is my first post here.

I baught my first car a couple of months ago which is a Toyota Corolla 1.6 vvti Tspirit. I absolutely love the car.

I'm looking to buy an exhaust backbox for it, something that'd hopefully add a few HP and sound a lot nicer, but I'm struggling to find ANYTHING that will fit it. I don't really want to be cutting through pipes or welding etc just to get the new exhaust to fit but I can't find anything that will just bolt on. Does anyone have any ideas of where I can get one? Any websites or specific back boxes you guys might have used yourselves?

Many thanks. Jack