All Things Mk5 > Performance Modifications

Decat vs sport cat

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willk86:
Sorry if this has already been covered millions of times...

Is there much loss in gains by going with a sports cat on a 3" downpipe?

I'll be using a standard cat back for now, looking at the pipeworx downpipes as they look like decent bits of kit plus I know a few people that have had stuff from then before, bikes and cars.

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Dan_FR:
Pro's

* Gains in flow over stock
* Will pass an MOT with plenty of heat
Cons

* Doesn't flow as well as a decat so will sacrifice a few HP up top. How much depends on the individual setup
* Will pass 1 MOT, maybe the following year too with LOTS of heat. Then it won't and you'll either need a friendly MOT tester, a new sports cat or refit the standard one
Me personally - Decat everytime, refit standard annually if needed

Manny_ED30:

--- Quote from: Dan_FR on December 14, 2017, 09:33:14 am ---Pro's

* Gains in flow over stock
* Will pass an MOT with plenty of heat
Cons

* Doesn't flow as well as a decat so will sacrifice a few HP up top. How much depends on the individual setup
* Will pass 1 MOT, maybe the following year too with LOTS of heat. Then it won't and you'll either need a friendly MOT tester, a new sports cat or refit the standard one
Me personally - Decat everytime, refit standard annually if needed

--- End quote ---

This is interesting Dan  - but say for those who run a sports cat on their daily and hard/spirited drives are far in between, would it still be the case of the sports cat only doing its job for so long until you need a friendly MOT tester?

Dan_FR:
Yep. Why do you think the sports cats are so cheap compared with OEM quality - the quality of the precious metals inside is awful. They are made as cheaply as possible. Hey, you may be lucky and get 2 or even 3 years, who knows..... But you certainly wont get the same lifetime that you get from an original part

Manny_ED30:
Ahh right, never thought of it like that in all honesty!

Always been abit skeptical about going decat as the noise increase from removing the cat may become abit of an annoyance.

My thinking was a sports cat BCS DP, front silencer delete with the variable tone back box would be a good set up, gains wise and noise. If I opted for this but with a decat, won't it be too loud?

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