de-cat advantages and disadvantages

[wazza16v]

Hello there just a quick question on de-cats, i did notice a difference on the sound of my car when i replaced the cat with a de-cat, but it seemed to be a bit sluggish on pull-away.I was thinking it might be a to do with the lack of back pressure from the exhaust, does fuel economy get reduced and by how much?

[Tommo]

Didn't notice any difference in fuel consumption with my decat on mate, but much prefer it with the cat on tbh, more torque lower down the revs, I think it is to do with back pressure. I do miss the sound of the decat tho...

[wazza16v]

I will put the cat back on once i get a chance, but i will componsate the noise loss and put the induction kit on as it freezing out there :D

[Tommo]

Not many people run a cat on here (think I'm one of a few), but my car just seems to run better with it on so I left it that way after the last MOT, still got the decat in my shed!

[wazza16v]

don't tell anyone but this might improve my quarter mile time at santapod, u never know my launch might be improved with more botton end torque.

[VIPERONE]

i run a cat...it makes your car feel quicker..but i know for certain the midrange grunt is alot more with a decat.

[wavy]

im still using a cat because of the reasons above
lose 1 bit of grunt to gain another
i might try a decat after my next mot(april)

[Andyvalver]

Ive been running a de-cat for a few years now. Main thing i noticed was it pulled better at higher speeds 3rd gear onwards. It seemed no better below 60mph really. Sod the low down grunt imo, mines always on the boil anyway

[Daz.]

I run a cat - leaving it on I think... power can be gained elsewhere

[VIPERONE]

. Sod the low down grunt imo, mines always on the boil anyway

you thought about changing the coolant, and installing a low temp fan switch/thermo?