Hi

Ive got a 2.0 focus ESP

Its got a cat back system with no centre silencer and is very loud

It also has the standard manifold and cat, which annoys me.

Ive bought an ST170 manifold from the bay, and am aware that i also need to find an ST170 flexi hose, in order to mate the mani to the 'zorst.

My question is, what do i do about the green and blue lambda exhaust sensor plug things??

Do i somehow attach them into the mani? Or just leave then unplugged? Rip them out etc??...

I.e. Are they needed for the running of the car? And without them it wont run, sort of thing.

Also, finally, the car WILL be de-cat when the mani and flexi are in, because in the 2.0 the cat goes straight on the mani, whereas in the ST170 it goes midway in the exhaust system. So basically where do i stand with and what do i do about the sensors?

Cheers