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no cat in exhaust 

 

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 Post subject: no cat in exhaust
Posted: Thu May 28, 2009 10:28 pm 
Oompa Loompa
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i have an ef 6 with the usual mods. thinkin bout knockin the cat out, just wondering if this will change noise much? and how? and weather it will change smell at all?
Cheers.
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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 10:38 pm 
Getting Side Ways
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legal factors aside, yes it will change the smell of your fumes, and the exhuast note will change (sometimes better, sometimes worse, depends on the rest of your system)
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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 10:43 pm 
Oompa Loompa
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ok. i have extractors 2.5" pipe through to a single sports muffler.
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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 10:48 pm 
Getting Side Ways
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As for the smell - it will probably smell rich now, as it probably will be running a touch rich(er, as theyre rich stock). Wont smell like rotten eggs or whatever.
Power difference is minimal, as is sound.

 

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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 10:50 pm 
Getting Side Ways
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If you do it, make sure you go sit behind the car whilst its running after.

If you aren't prepared to do that, then don't do it.

Look at the pro's (marginal gain in power unless yours is clogged) and con's and it is a pretty self explanatory mod.

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 11:25 pm 
Oompa Loompa
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it cant smell too bad. cars pre '86 ? had no cats and they dont stink.
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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 11:31 pm 
Getting Side Ways
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Mr. Plod like to insert battons into rectums of people with catless cars.

also like to rape little p plate boys who put oil on roundabouts as a few locals found out last weekend

 

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 Post subject: Re: no cat in exhaust
Posted: Thu May 28, 2009 11:35 pm 
Stock as a Rock
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sounds crap and is no gain at all
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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 12:10 am 
Getting Side Ways
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theres no ponit noise wont change much it aint legal will offer no power gains complete waste of time

 

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 12:12 am 
Getting Side Ways
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EFinsane wrote:
it cant smell too bad. cars pre '86 ? had no cats and they dont stink.


HA! Because the smell is the reason cats are on cars...

 

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EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 11:22 am 
Getting Side Ways
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im pretty sure it was to clean up the emmisions out the tail pipe rather than an egg f@rt like smell..


minimal gains.. -huge fine...... hhhmmm!!!!! :roll:

if you want gains and to stay legal.. just get a hi flow cat... - best of both worlds...

 

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 12:30 pm 
Getting Side Ways
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Yeah it does smell rich without a cat, especially after first starting it up for the day. I run no cat, no law to say you need one in NZ, and i doubt there would be much gain by gutting it, removing etc, unless its blocked.

My EF never had a cat from factory, to me without a cat it has a kind of hollow throaty sound, but i reckon it sounds better than other e-series 6's ive heard with a full exhaust with a high flow cat. The cat makes the exhaust seem sort of raspy when it revs out, without the cat its got more of a bark to it, sounds raw :twisted:. But as said the sound with or without the cat will also depend on the exhaust you're using

 

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 4:42 pm 
VIC Cruise Moderator
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i have a "modified cat" in my wagon and yes the 1st start is rich and there is a bit of echo from the cat working like a resonator so close to the motor. if its fine now ide leave it... mine was stuffed!

 

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 7:08 pm 
Parts Gopher
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A mate removed the cat from a tuned 2005 Integra Type R that he uses for a bit of circuit racing. Considering he is operating in a rev zone way beyond the capacity of any E-series 6, i highly doubt a street app would notice any difference.

 

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 Post subject: Re: no cat in exhaust
Posted: Fri May 29, 2009 9:01 pm 
Getting Side Ways
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KWIKXR wrote:
Yeah it does smell rich without a cat, especially after first starting it up for the day. I run no cat, no law to say you need one in NZ, and i doubt there would be much gain by gutting it, removing etc, unless its blocked.

My EF never had a cat from factory, to me without a cat it has a kind of hollow throaty sound, but i reckon it sounds better than other e-series 6's ive heard with a full exhaust with a high flow cat. The cat makes the exhaust seem sort of raspy when it revs out, without the cat its got more of a bark to it, sounds raw :twisted:. But as said the sound with or without the cat will also depend on the exhaust you're using


I found the complete opposite with exhaust note. When I had the pacies fitted the exhaust guy said my cat was hollow(original 10yr old cat), I replied "yeah I know, it all fell out when i fitted the 2.5 in sports exhaust". The sound was rough and raspy. When I ended up fitting a high flow magnaflow cat the sound from the exhaust deepened and I picked up a bit of power down low.

Maybe if the cat has a 2.5in pipe welded through it it would sound ok, but basically mine was just like a big empty turtle shell with the exhaust gases bouncing everywhere...............

Cheers and have a nice day :mrgreen:

 

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