Pre-Cats Decision..

[markiii]

it's because the Ceramic ones "aren't the highest quality"

lets just say I beleive teh source  s:wink: :wink: s:wink:

[Chris_h]

As an aside (and apologies as I am sure it is burried somewhere in the archives), does removing the precats in theory liberate the extra 2bhp the Celica has? or does the Celica use a different map / or another reason why it has a tad more power than the 2?

Whichever theory you support re cause / effect, I see removing the pre-cats as a no brainer.

[Anonymous]

Che is cheap, and some may argue gives a bit more performance.

I should say so, remember it's a direct copy of the TRD manifold (£870) - I gained 6bhp when I switched from gutted manifold to Che's.

(£20 per horse for what it's worth)

BTW - I didn't see any major gains after gutting my precats. Sounded a bit throatier though.

[Anonymous]

Although you say if it ain't broke don't fix it, I think from my own experience that there is an inherent oil burning issue with these engines.

IMHO the oil burning damaged the pre-cats which got back into my engine and exacerbated the oil burning problems... a vicious circle... now I seem to use more oil than the Arabs have to sell  s:!: :!: s:!:  

Therefore IMHO you should remove the precats before the engine destroys one/both of them and you enter the vicious circle... In my case I was too late to find out about the issue. You know about it now - think how sick you'll be IF you leave them in and IF they break up and knacker your engine.

Nothing in life is certain but you can take action now to reduce the probability of it happening to you...