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I was wondering where the cats are located on the 147 gta, I believe there are 4 of them? I was thinking of replacing the exhaust from the cat back with a performance one and was also pondering replacing the downpipe with a custon one?
 

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One in each exhaust manifold.
Two under the car just before the system joins the main exhaust.
 
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Re manifold cats: They're probably needed to pass an MOT but mine goes through with just one cat (2.5 exhaust and manifolds).

Removal is a big job - I've not done it but I think you need to remove the subframe and even then I'm not convinced you can get it out.
 

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In the front Grill ... but only if you hit them hard enough :lol:
 

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They look like milk bottles...bloody ugly things!
 
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