Pre-Cat 1.8

[Fudgepacker]

well just wandering if any one has removed the pre cat of the manifold and if it made any diffrence to the perfomance at all as i seem to get mine to glow if i boot it hard and will i need a new manifold

[mattie007]

Id be interested to know about this aswell.
Im sure you can remove one of the cats and it will still pass the MOT.

[Fudgepacker]

that was somthing else i wanted to know will it still pass the mot

[XPCobra]

buy a janspeed manifold, have removed the pre cat before and didnt notice a difference ( on a 1.4)

[Fudgepacker]

i never had one on my 1.4 rover but im wandering if this pre- cat will restrict the 1.8 by much

[XPCobra]

doubt it, the pipe bends are crap on the standard manifold anyway

[Fudgepacker]

so if i upgrade my manifold and remove the pre-cat will i gain any thing

[mattie007]

You will get gains then, but Janspeed manifolds are quite expensive.

[Fudgepacker]

just been told today that the 120 has high emisions and if you remove the pre-cat you can fail your mot

[XPCobra]

the pre-cat is inside your manifold, so if you replace your manifold with a janspeed item it won't have one ( however you will need a janspeed sports cat or decat pipe or your cat custom made to fit )

doubt the 120 wuld fail without a pre-cat, however have known them to fail without the proper cat

[Fudgepacker]

yeah its still got its main cat just wanted to know if i could lose the pre cat or do you think they do a sports pre cat

[Fudgepacker]

will i gain any thing if i keep the pre cat and just remove the cat with a good cat aback on aswell

[mattie007]

It doesnt half get confusing!

Best results will be a janspeed mani (without precat) and a janspeed sportscat I guess.

[afcbadam]

will i gain any thing if i keep the pre cat and just remove the cat with a good cat aback on aswell

you should see 5-6 bhp i would have thought. for best results manifolds, sports cat and cat back are needed. iirc if gives the 120 about 10-12bhp

[Fudgepacker]

i want more bhp

[Fudgepacker]

im going to save for a 180

[weagie]

Ditch the main cat, then get the manifold. I've just got that to do. The cat's sitting in my boot now.

[afcbadam]

im going to save for a 180

you wont need to save, just px the 120 for a 180.

[Fudgepacker]

i need a new front windscreen now got a 35cm crack now ******* stones