I had a sebring 6x4 oval exhaust on mine and the fit and build quality is spot on. It tucks in exactly where the standard exhaust used to sit.
They have a really deep low hum to them aswell on tickover. Nothing too over the top but enough to know it's there.
I paid £135 for mine new.
Sold it for £60 to a pal. Always regretted getting rid of it.