help?! 4 branch manifold and exhaust system

[joe_saxo]

alrite, ive got a few questions i hope you guys can answer, right, ive got a saxo mk2 vtr and my standard exhaust system is nakered so ive beein saving and managed to buy a raceland 4-2-1 manifold, and a full scorpion cat back exhaust system.
the manifold came today and didnt come with any fitting/bolts etc, dunno if you need them but hasnt come with any apart from the manifold itself. the other thing is on my standard manifold it has one senser/plug thing at the top of it and one on the bottom and the 4branch only has a hole to plug in at the bottom!?? and ive heard that you have to move the oil filter so that the manifold will fit, but my 4branch has one of the branches curved over the rest so it looks like it could be a stianght fit?? can some tell what i need to do and what extra parts i need if so? thanks, joe

[makaveli144]

I dont think it will be a straight fit and for the other sensor you will need a sleeve. I think you can get them from gmc, then you have to move the other one so it runs down the back of the engine and into the hole.

You will need a new gasket, and its best to get a new set of bolts,nuts etc just to be safe.

[joe_saxo]

do u no any where else that sells the sleeves online?

[Thirt33n]

i know this may sound stupid but why do u need a new gasket?

[boz]

you will need the following to fit a manifold:
new gasket
new manifold stud nuts
new gasket for maniold/cat joint along with the bolts,springs,washers and nuts (comes as a kit from citroen)
2 10mm spanners
exhust putty

you will need to follow the wires for the lambda sensor, they normally end up at a connection above the gear box, just disconnect it and remove lambda sensor. jack the car up and disconnect the manifold/cat pipe joint, 10mm spanners are needed. loosen the bolt that holds the manifold onto the gearbox.
remove old manifold (careful you dont damage radiator) then remove the lambda sensor, place new gasket onto manifold studs, place new manifold on, place nuts on studs, loose for now,
fit bolt that locates manifold onto gearbox, loose for now,
fit the new gasket to the exhaust system, place some puttey around this gasket and also around the inner lip of the manifold where the gasket will seal against. remove the collars that are in your old manifold (where the bolts went through) fit these to the new manifold. then fit the 2 bolts through the joint, place the springs on from the front of the car, then the washers and then the nuts, just nip these up for now.
tighten the manifold stud nuts.
then tighten the joint with the springs on up, then tighten the bolt that holds the manifold to the gearbox.
final, run the lambda sensor around the back of the engine and screw it into the hole in the manifold, nip the lambda sensor tight, then reconnect it to the harness.
start let car up and check for any leaks ;)

the idea of fitting a new gasket, is that the old gasket will be compressed and brittle from the heat of the exhaust. the gasket is designed to compress and for the shape of the pipe that its is sealing ;)
you should always fit new bolts and springs to the manifold/cat joint to mate.

if you are going to fit a de-cat pipe, you need to place the lambda sensor that is in the cat into a sleeve, this sleeve tricks the ecu into thinking its reading clean air.
the system is designed so the cat pipe cleans the gas coming out of the engine, the first sensor in the manifold reads the dirty gas and the second reads the clean gas. without a sleeve, both sensors read dirty gas and will send the ecu loopy and it will display the ecu warning light on the dash.

hope that helps ;)