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cat (exhaust) pipe diameter??

I've just bought a powerflow exhaust system including back boxes & midsection, it's 2.5" in diameter. I was wondering what the diameter of the cat outlets are & if they will mate up with the new exhausts I've got :confused:

 

I don't really want to remove the exhaust until I know that the new pipes will fit as the car is my daily driver!

 

Will I need to buy 2.5" de-cat pipes?

 

Cheers,

Shaun

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    Come on, I don't believe that no one out there has their Zed in bits, lol

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