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My cat makes loud noises and I am starting to think its restricting the air flow because the turbo boosts upto 15psi then by about 6500rpm its only pushing 6 - 7 psi

Sometimes i get no boost untill 5000rpm!!!!

It does not hold boost at all.. Would a blocked cat cause this ??

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https://www.sau.com.au/forums/topic/24418-blocked-cat-noist-cat/
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When my cat got blocked I had to take it to the vet to get a needle, wasn't pretty :P

Maybe take ur car to an exhaust shop and they should be able to remove it and have a look, probably wouldnt take more than 20mins of their time :)

took the cat out last night and checked it and it seemed ok.

Still have the problem where it goes up to 12psi and drops pressure all the way down too 6psi when it reaches 7000rpm

How do you check the wastegate? this is a VL T3 turbo with a 55mm front wheel stuffed into the standard housing

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