decat isit worth it?

[welshzsoc]

hi guys has any1 done back to back testing on a vts/gti with and without the cat fitted ? are the gains noticable or is it a placebo ?

[Tom5190]

Supersprint claim 7hp iirc from a full system on a 16v

[devilsadvocate]

Is it noticeable?

Not in my experience and any gains you notice will likely be placebo.

On the rolling road you may get hp gains though.

[welshzsoc]

ah i see , ive only got a shitty hoffman decat pipe on mine atm , thinking of going back to the cat to quieten it down abit but dont wanna lose performance .

[welshzsoc]

got this 1
http://www.ebay.co.uk/itm/Peugeot-106-GTi-96-10-00-Exhaust-De-Cat-Pipe-/350658694075?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Model%3A106&hash=item51a4e30bbb

[jasonmayall]

The Hoffmans are cheap shitty exhausts - I fell for it once cause it was cheap and I was desperate. Lasted almost a couple of weeks till it blew a hole, the bends are also some of the worst I've ever seen lol.

Go for something with a bit more quality and you might notice a very, very slight gain.

[luthor1]

If you bought a NEW Citroen cat, centre pipe and backbox, I mean GENUINE Citroen, as a basis, then you will feel very little from an aftermarket decat/full exhaust only, but most of you/us will be looking at shitty German and Swedish backboxes, crappy unbranded mid-pipes and grotty old cats.

you'll see a HUGE improvement from this, but not over shiny new standard on its own

[welshzsoc]

think il just chuck the cat back on , iv already got a buyer for the decat pipe lol

[martin1985]

de-cat is mainly better for sound, but saying that it might a add a little bhp

[m4tt274]

on a vtr, going from the cat manifold to a decat tubular sees a big differance in power delivery and noise.

recently i went from a:
- 4/2/1 raceland manifold with a supersprint mid pipe and back box
to a
- 4/1 raceland manifold with a bodge up midpipe with a sports cat and a supersprint back box.

eg, installed a cat.
Performance isn't noticeably different. Its a little more punchy low down, little less punchy past 5,000rpm. Could well be the manifold difference.
most noticeably it's about 8db quieter (without measuring properly) with the sports cat in place.

[choko_h]

If the cat is used for long time for sure the de-cat pipe will provide a better response, if its new there wont have a big difference but still will be better. The best will be to change the cat with resonator designed for your car. Cheers!

[m4tt274]

why is it we think an older cat will restrict more than a new cat?
not a challenge, i would just be interested to know.

[wadoryu]

why is it we think an older cat will restrict more than a new cat?
not a challenge, i would just be interested to know.

Moe clogged up, less effient.

[LSOfreak]

dont all decat pipes do the same thing? why would that hoffman decat be any worse than another one?

removing the cat was one of the best mods ive done to the saxo, mainly due to the sound though

[jones91]

^^
The only reason why one decat would be more restrictive than the other would be from the diameter of the piping, e.g I think Hoffman exhausts and decats are about 43mm diameter, where as some other brands like supersprint and kam racing are about 50mm, allowing more air to flow through it

[Liamjrhodes]

also the sharpness of the bends influences the flow of gasses and slows them down which you don't want if looking for performance

[m4tt274]

what would a cat get clogged up with? saxos hardly coke up they run so lean!