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OEM cat / Sports cat / De-cat

Engine/Gearbox questions and discussion
nalla
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OEM cat / Sports cat / De-cat

Post by nalla » Sun Feb 23, 2020 3:50 pm

Hi,

Anyone know what the power difference could be on the same car having an OEM cat, Sports cat, or being de -catted, assuming tuned accordingly afterwords.

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OEM cat / Sports cat / De-cat

Post by Drax » Sun Feb 23, 2020 7:56 pm

if you amalgamated into other genuine power gain mods, it would be very advantageous to have a sports cat or go full de cat. if you want a few more ponies with a spoon copy chip, better exhaust system, intake etc which is a common setup then again quite worth it. on it's own, unless you just want more pops & bangs even after a tune i think it wouldn't be worth it.

no idea about figures, depends on the age/condition of the engine and other setup mods.

that's just my 10p :)
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OEM cat / Sports cat / De-cat

Post by nalla » Mon Feb 24, 2020 11:44 am

Many thanks,

I have a de- cat at present, but MOT time is a bit of a pain. Wondering if it's worth putting on a sports cat.

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OEM cat / Sports cat / De-cat

Post by vanzep » Mon Feb 24, 2020 1:22 pm

newkid has a sports cat to his torneo H22 - its one of the magnaflow ones - so he could let you know what he thinks...
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OEM cat / Sports cat / De-cat

Post by nalla » Mon Feb 24, 2020 5:09 pm

Thanks.

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OEM cat / Sports cat / De-cat

Post by ATR84 » Mon Feb 24, 2020 5:25 pm

My bum dyno thinks there is a small but noticeable difference between cat and no cat, I can't comment on sport cat's though.

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OEM cat / Sports cat / De-cat

Post by RattyMcClelland » Mon Feb 24, 2020 6:13 pm

I had a sports cat when I was supercharged. Problems happened, suddenly my cats internals were no longer there. :thumbdown: ......wait...the internals ended up in the back box, melted and engine almost fully failed.

Saying that. Melted sports can most likely was due to the extreme exhaust gas temps I was running from being supercharged and the retarded timing it was running.
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OEM cat / Sports cat / De-cat

Post by Scott560 » Mon Feb 24, 2020 8:06 pm

on a completely stock h22a5, i noticed a little more top end power when there was a decat fitted. It was quieter in the cabin strangely (and probably slightly louder outside), but that was more noticeable than the slight extra few horses.
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OEM cat / Sports cat / De-cat

Post by newkid » Tue Feb 25, 2020 5:48 pm

vanzep wrote:
Mon Feb 24, 2020 1:22 pm
newkid has a sports cat to his torneo H22 - its one of the magnaflow ones - so he could let you know what he thinks...
Yea 200 cell magnaflow on the torneo. Wouldn't say you notice a huge difference untuned but it's never caused an issue come mot time. Tuned with the fujitsubo mani/downpipe and 2.5" system is when the difference will be told. If your not planing on tuning at some point I wouldn't bother.

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OEM cat / Sports cat / De-cat

Post by nalla » Tue Feb 25, 2020 6:00 pm

Thanks for that.

I have a 3" stainless system with a PLM manifold. It's has a '99 Euro R engine in it, after the original failed, and as mentioned, no cat at the moment. Dyno'd after the engine was installed at 239.8 bhp, but was wondering if a 200 cell was going to affect this much.

MOT time is pain time with no cat!

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