Header Install Options

[94ST2]

Alright I recently got a OBX 4-2-1 header that was modified to fit the celica. My question is how hard would the instalation be? When I unbolt the old header and downpipe im pretty sure I can use the same bolts for the new one. Also what kind and how many gaskets would I need. Three most likely right? One for where the header bolts up another for where the header bolts to the downpipe and another for where the downpipe bolts to the cat. Any other useful information that would make the installation easier would be helpful.

[CheesyLobster]

Alright I recently got a OBX 4-2-1 header that was modified to fit the celica.  My question is how hard would the instalation be? When I unbolt the old header and downpipe im pretty sure I can use the same bolts for the new one.  Also what kind and how many gaskets would I need.  Three most likely right?  One for where the header bolts up another for where the header bolts to the downpipe and another for where the downpipe bolts to the cat.  Any other useful information that would make the installation easier would be helpful.
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bring it to an exhaust shop and they will do everything for you. If you want to put it in yourself though, you will need the exhaust manifold gasket, and should probably cut right before the cat and keep that gasket untouched, then weld from that cut and have a flange on the other end for the header; then you'd need a gasket for that flange.

[Batman722]

Alright I recently got a OBX 4-2-1 header that was modified to fit the celica.  My question is how hard would the instalation be? When I unbolt the old header and downpipe im pretty sure I can use the same bolts for the new one.  Also what kind and how many gaskets would I need.  Three most likely right?  One for where the header bolts up another for where the header bolts to the downpipe and another for where the downpipe bolts to the cat.  Any other useful information that would make the installation easier would be helpful.
[right][snapback]355280[/snapback][/right]

bring it to an exhaust shop and they will do everything for you. If you want to put it in yourself though, you will need the exhaust manifold gasket, and should probably cut right before the cat and keep that gasket untouched, then weld from that cut and have a flange on the other end for the header; then you'd need a gasket for that flange.
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almost 100% correct...you would need to have a shop do it for you. Your header should of come with a gasket (cheap one), get a new one from a Toyota dealer. You should unbolt the b pipe from the secondary cat and you will have to get another oval gasket for the flange (best to use 2). You will also need to have your new b pipe extended about 4-6 inches and have an 02 sensor flange welded into the pipe in a spot where is will not hit your rack or anything around it.

when you said

was modified to fit the celica

exactly how was it modified ?

I have a 4-2-1 header on my ST...I know exactly what needs to be done and how it should be.

[94ST2]

Well I bought it off of RedSunCelica he was using it on his st. I believe that the down pipe which is all one piece can bolt directly into the furthest back cat. I sent him a pm but im still waiting for a reply to that. I went to an exhaust shop today and they wont do it because it eliminates the first cat and wasnt for the celica specifically. How do we host pics on here so I can post some to give you guys a better idea of how it looks like.

[Batman722]

go to photobucket.com, sign up and post from there. If Redsun already had it on his ST then it is probably good to go directly onto yours. jack up your car (use stands) and take a look underneath. You can do it with a lot of PB blaster and some brut force (and maybe a sawsall)

[94ST2]

Yeah im going to jack it up and take a look at everything on friday and see what the deal is. Hopefully it will work out. If not I have 2 uncles that are mechanics and Ill call them to the rescue.

[nik]

once the main page is back up go look at my 7afte how to it shows and talks about taking the manifold off etc with pics