Upgrade Cat or Not?

[MM2death]

I've currently got 3inch from turbo back, but has a standard cat. Any whorthwhile gains achieved by installing a high flow item? What what do they usually cost? Are they worth it? Would my current setup be very restrictive?

PS: The cat was put on when complianced.

Regards,

Scott

[NismoR34]

Good question Scott.

I can give you a price range on 3inch cats: $160 > $350 depends on brand and where you buy from. Worth it? I would say yes based on cost - There is a saying "your exhaust is only as good as the smallest restriction". In your case its the cat!

Hopefully other people can better answer the first question? I am about to buy a 3inch cat too.

[crooser]

IMHO

dont expect a big increase in power... might sound a bit different though. even a gutted cat has shown no improvement for some.

of coarse, its illegal to gut your cat

[APA]

not much more power, but better flow more responsive i just put a highflow 3 inch cat on my car

adrian

[Guest nismo_trip]

How much crap can you get in if you gut your cat ?

[NismoR34]

Adrian, did you notice any sound difference when adding the highflow cat? Louder?

[MM2death]

Well if they do find out and catch you it's like a $10 000 fine. Don't quote me on that though. Fair enough you can gut it and from the outside it looks like a legal cat, but if a copper sees you shooting flames from your zorst and puts one and one together...you might have to take your car for a machinery! Then you'll get ****ed over.

Scott

[predator]

mines got a highflow cat... not really any louder than standard.. depends of course on the noise level of the rest of the system.

[APA]

not really much of a difference in sound, coz my new catback i just put on a week ago is ****in loud anyways

adrian

[Gianni]

Hi Adrian_perth,

what sort of a cat back system do you have on your car being so loud? and does anyone know the difference in having a 8lt 3" hi flow cat & a 5.5lt 3" hi flow cat? is the bigger one supposed to be better for exhaust flow? an explanation on this would be good!

Thanks,

Gianni

[CR34TION]

Good question Gianni... I was going to buy a large volume high flow cat for my r34, but apparently they don't fit. I would definitely get a high flow if i had the money then followed by front pipes.

[Gianni]

What a coincidence! I just recieved my hi flow cat today thanks to Batmbl. I ordered a 3" hi flow made be Catco which is also the largest one out of the lot being the 8lt one I think?

Will let all know how it goes when I fit it and if it changes the exhaust note and performance!

Cr34tion,

there must be a hi flow cat available for your r34! I thought that the r33 one would bolt straight up? correct me if I'm wrong coz I'm not 100% sure!

[RON-15H]

gianni how much did that cat cost ya?

[Guest RedLineGTR]

if ya dont have anything else to waste money on get the cat..

[Sydneykid]

Hi Guys, sometimes when compliance is done for a low price a cheap cat is fitted, the cheapest one they could find. So on some imports you get a good increase from fitting a decent cat. Others have a decent cat to start with, so fitting one doesn't make much difference.

You could get a good exhaust shop to drop the exhaust at the cat and check it out. But probably wouldn't cost much more to simply fit one that you know is good, it is cheap insurance.

My 20 cents worth

[NismoR34]

Hey Sydneykid,

what do you know about the factory cats that come with say an r33 or r34? are they any good in terms of flow? I am pretty sure thay are not adr compliant though are they?

[Sydneykid]

Hi nismoR34, my understanding is that compliancing an import requires changing the cat. Put it this way, I have never seen a complianced Skyline with the original cat. If an R34 had an original cat, I would not be very worried that it was a restriction. It's the cheap ones fitted by the low cost compliancers that are the real problem.

Hope that clarifies

[NismoR34]

Yes it does, thanks!

[Guest RedLineGTR]

saw my orignal car fakren piece of just, would throw it probably at someone before i use it ever again for a cat

[G0DF4Th3R]

Guys, adrian_perth has a screamer + an already loud exhaust so the extra noise from the car wouldnt be noticed