I fitted them as resonators on my 06 GTO with the cat-back Corsa Sport. I am very happy. The Sport was too loud for me and not the tone I was looking for, but I liked that it didn't have a hum so I didn't want to change it. I added a Corsa Touring resonator behind the X-Pipe which brought the volume down to a reasonable level but didn't produce the rumbling tone I was looking for. These Borlas as resonators instead of the Corsa Touring resonators are only slightly louder than the Corsa Touring but with a really sweet hum.
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