Exhaust help

[Quinny1]

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 

[niZmO_Man]

You have an N/A with a huge 4" cat back?

[Quinny1]

Yeah it's how it come from the previous owner

[oweban]

Change it to a 2.5" catback IIRC (happy to be corrected by the NA boys) - a 4" will kill backpressure and make the car weak as piss.

Changing to high-flow cat on an NA isn't really worth the dosh. Just keep it nice and simple.

[admS15]

4 inch exhaust or 4 inch tip?

[Quinny1]

4" cat back

[niZmO_Man]

I highly doubt a 4" cat back will bolt up to standard cat, unless there's a reducer in between.

Take it to an exhaust shop and get them to have a look.

[Quinny1]

Thanks