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Saxo Engine/Performance If you're interested in tuning Saxo engines, or if you need to know something which is engine related... this is the place for you.

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Old 8th January 2020, 07:39   #1
Join Date: Aug 2019
Posts: 9
Default To decat or not to decat? HELP

Right, I have a second hand magnex exhaust for my vts and it comes with the decat pipe.
Now I'm moving towards fitting it from the cat back, straight with no boxes until the back box. However... Ignoring the fact I'd struggle to pass an mot with it decatted, what are the effects of decatting it?

I hate droney exhaust and wonder would it be less or more droney with it decatted and what are the other downsides or plus sides?
All help greatly appreciated!!!
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Old 8th January 2020, 19:25   #2
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Join Date: Dec 2012
Location: Perth
Posts: 3,402
Car(s): Peugeot 106 1.5D Turbo Peugeot 106 Rallye

It point blank cannot pass an MOT with no CAT. there's no struggle about it. If it's not fitted it's a fail.

It'll be more drone with no cat fitted, you'll also have a slight reduction in back pressure. this will make the car less torquey mid range. If you're not mapping the car, it won't be running optimum.

Personally, I wouldn't fit the decat pipe if you're using it every day.

If it's a track toy, then go for it.
The rain kept a trollin'
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Old 19th January 2020, 12:42   #3
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Posts: 11,594
Car(s): yes hmmm

If you want your car to sound like shit, run like shit, and fail the MOT, do it.
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