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Exhaust help

Quinny1
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Quinny1

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Exhaust help

Hey everyone so I own a 1994 r33 gts skyline as a daily and when I got it, it came with a 4" Just jap cat back system, 

I've recently found out that I have a leak in my exhaust but it's coming from behind the cat, and I'm stuck in debating wether or not to replace the problem with extractors, but some people have told me I'll only be getting restriction due to my cat and have told me to get a hi flow cat, 

Would anyone on here be able to tell me where I could get a 4" cat for my exhaust and extractors and what brand extractors I should get? I've been looking at just jap ones 

I'm located in Wollongong NSW but have no problem traveling to the city 

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