POLL - De-catting Skylines - Discussion - Skyline Owners Forum

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View Poll Results: Should you de-cat a skyline for performance ?
Yes 13 76.47%
No 3 17.65%
Not sure 1 5.88%
Voters: 17. You may not vote on this poll

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Old 11-09-2017, 06:58 PM   #1
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POLL - De-catting Skylines - Discussion

Hi All,

For a bit of fun... Should you de-cat a Skyline to improve performance...

Discuss
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Old 11-09-2017, 09:24 PM   #2
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my cat on a previous car caused performance issues (suffocated shall we say) and once removed it made a massive difference
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Old 11-09-2017, 10:02 PM   #3
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Along with other mods why not makes sense
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Old 12-09-2017, 11:39 AM   #4
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*NO, if you upgrade your exhaust system then you should upgrade to a sports cat, its why companies make them.

Yes, if you want to increase horsepower and torque whilst reducing backpressure, heat soak and detonation on a tuned vehicle.

*Only if you don't have a trusted MOT tester
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Old 12-09-2017, 02:53 PM   #5
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stock cat(once in good shape) is good up to around 450bhp ish. after that it creates a bottle neck. I find if i put in a decat/sports cat, the car just overfuels and runs like crap. even with remappable ecu. put my stock cat back in.

the heat will kill it though so launch control etc
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Old 13-09-2017, 11:06 AM   #6
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De cat on mine.
Did a de cat as thought that was the thing to do to get more power.
I also did it to preserve the life of the cat.
Seems a bit loud now so considering a silent de cat.
Think the poll should say have you not should you.
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Old 13-09-2017, 01:14 PM   #7
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Have a sports cat and sports exhaust. Definitely louder and feels more responsive. And went straight through mot.
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Old 14-09-2017, 06:25 AM   #8
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I just swapped the de-cat pipe for a sports cat for MOT purposes.
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Old 14-09-2017, 07:46 AM   #9
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Flames!!
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Old 23-09-2017, 10:46 PM   #10
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No cat for me!
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Old 24-09-2017, 05:14 AM   #11
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My old one was decatted. This was despite after having been to cities that have smog issues and other environmental issues. But when a saw an article in Option magazine that showed the very small power difference of a car tested with no cat versus a sports high flow cat I changed my mind when building my current one. High flow cat for me.
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Old 24-09-2017, 10:15 AM   #12
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Quote:
Originally Posted by GTES-t View Post
My old one was decatted. This was despite after having been to cities that have smog issues and other environmental issues. But when a saw an article in Option magazine that showed the very small power difference of a car tested with no cat versus a sports high flow cat I changed my mind when building my current one. High flow cat for me.
What sports cat did you go for in the end?

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Old 25-09-2017, 05:33 AM   #13
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Quote:
Originally Posted by SkylineSi View Post
What sports cat did you go for in the end?
I went with the Japspeed high flow cat. It's been great and still get some pops and bangs that I enjoy on decel.
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