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NEED experienced advice on HiFlo Cats

23 posts in this topic

Posted · Report post

Hi guys; NEED experienced advice please before I commit:

Want to swap out the stock cats on my 2003 350Z (with 180,000kms; mine is a stock 2.5" system), and looking at hi flows; in particular the 100 cell, but am concerned about the possibility of throwing a code...

Anyone DONE this?

Maybe I should get a 200 - 400 cell hiflo JUST incase?
Either way, it's bound to flow better than my old stockers...

Thanks.

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Posted · Report post

I've run 100-cell BERK HFC in my 370Z for 6 years and have never thrown a code.

 

They are not legal though ....... EPA approved minimum is 200-cell

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Posted · Report post

Hmmm...That IS interesting (and positive) ;)
I don't imagine theres any difference in brands of cat? Should I look on ebay for one?

 

Yes, have discussed the emissions side with a supplier (am not overly concerned) but he said even a 200 cell may, or may not be 'legal', depending on who does the test...Then again, he also says the Z would be EU standard which means it'd take a 400 cell to be legal..

In any case, that aside - Did you notice any benefit over stock cats?
* I SHOULD maybe add that mine is a stock 2.5" system - Was yours?

ACtually; I'll add that bit to the original post now for clarity.

 

Cheers!

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Posted · Report post

It will certainly make a small improvement 

If you want to make a noticeable improvement: Equal length exhaust headers, hiflow cats, ECU tune  ($3k later...poorer but happier)

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Posted · Report post

hahaha...I SHOULD'VE added, I want to LIMIT the budget on this mod ;) LOL

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Posted · Report post

Trouble is if you do the headers later you are paying for some labor twice - better to wait/save 

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Posted · Report post

Trouble is; I've just spend a big chunk of change on the car (clutch and valve covers, coilpacks etc) NOT wanting to spend any more except getting the exhaust out with less restriction at this time.

 

 

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Posted (edited) · Report post

Arggg - you should have done the headers or CAT's when the gearbox was out for the clutch job - makes it easier/cheaper

You'll be disappointed with the cost versus benefit of high flow CAT's on their own

Edited by MartinZ

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Posted · Report post

TRUST ME: The gearbox needing removal was NOT planned! ;)

I don't expect MUCH difference with hi flo's; aside from the fact they are rep[lacing 180,000km stock ones, WHICH have probably copped a fair bit of crud in the last 6 months of driving it with a misfire.

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Posted · Report post

Petrol can damage them and reduce their efficiency - unlikely there will be any crud

My 350Z did 250k on the stock cats and they were fine

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Posted · Report post

...Unburnt oil residue?

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Posted · Report post

Is your engine burning oil?  It shouldn't be...

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Posted · Report post

No, but ran it with a misfire for 3+ months

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Posted · Report post

That may have thrown a little fuel into the exhaust but not oil

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Posted · Report post

In any case; they ARE old and you can feel them holding it back.

Anyone recommend a good exhaust place in Brisbane / Ipswich that aren't rip-offs?

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Posted · Report post

Hi Smack .

Mate I used Mr Muffler at Sumner Park . 

Ring  Alex on 3376 3444 and tell him NEDZ 

Recommended him . 

He fitted a modified a Invidea SS exhaust system with  HFC on my 370z as just a little  noisy .

Did a excellent job at a fair price .

I highly recommend him and I don't do that often . 

Cheers Ned.

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Posted · Report post

Interesting...

I've rung him twice in the last month, as he's in my general area; can't say I didn't feel like I'd be paying a fortune if I went there..

He says he doesn't sell the cheap cats.

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Posted · Report post

I bought the Invidia HFC on line x the states . I allready had the exhaust , I fitted the cats and he modified the exhaust to my specifications, and did a excellent value for money job . Sent from my SM-T800 using Tapatalk

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Posted · Report post

ok, well I can always get a price for fitting...But I'm fairly sure he already said it could be very expensive - I'll touch base with him again tho and mention you :)

Cheers

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Posted · Report post

How did you go buddy ? Did you talk to Alex again ? Sent from my SM-T800 using Tapatalk

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Posted · Report post

Haven't had time yet mate - hoping to be free come thursday.

Actually; stuff it - I'll call him now; just don't have time to show him the car yet...

 

...ok... $700 - $800 to fit...That's with me supplying the cats.

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Posted · Report post

Haven't had time yet mate - hoping to be free come thursday.

Actually; stuff it - I'll call him now; just don't have time to show him the car yet...

 

...ok... $700 - $800 to fit...That's with me supplying the cats.

complete rip off haha my mechanic charged me $120 to remove my cats and install decats

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Posted · Report post

That's what I'd expected and my mechanic said price should be.

Haven't gone ny further with it yet; can't find anyone that can reassure me I won't throw a code, even with 200's :(

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