"A-2.0L-XE EX-M-AST2-16V Exhaust manifold for Astra MK2 2.0L 16v £156.40"
Just a few questions though. Are these fairly straight forward to fit? Should the bolts be fairly easy to undo, I've heard that these can sometimes rust to the block is this true? I think that my exhaust should come away from the exhaust because it was only fitted a few weeks ago.
Do I need a get good quality gaskets and silicon sealer?
no sealer please ! The manifold gets up to like 600-700 degrees farenheit !
A new exhaust manifold gasket wont break the bank from your local vx dealer. The studs might be a problem, sometimes the nut has corroded to the stud thread in wich case the whole stud comes out the head. Not a problem though, just take it easy. Only problem i forsee is trying to get the two lower middle nuts off, cause these also hold the bottom of the heatshield on, access is tight, bit fiddly, will need a combination of extensions, 1/4 inch drive set or ring spanners to get them all.
The flexi join to the exhaust system is quite easy, its tapered and the mating surface of the manifold is just one big flange baby. Its a dry joint there too. Take care with the two bolts there, cause its a weird fine thread.
I'll get one ordered a.s.a.p. I'll give it a go, if I think It's gonna be too much hassle then I'll get my local garage to do it.
One thing that I wasn't sure of is the lambda sensor, what happens there?
Just been down to Lucas to equire about a exhaust gasket, they came back and said that none of their suppliers do one, they said that it might be a flush fit. Do I have to go straight to Vauxhall to get one????
Get one from http://www.autovaux.co.uk personally, I'd go straight to vauxhall for all the head related gaskets. They're always so much better. Only about 7 quid from Vaux direct, so it's not going to break the bank!
And no, they don't fit flush!
While your there, I'd get a set of new manifold studs + nuts. Minimal cost, but make the job look miles better. Future maintainance will be easier too. The last thing you want is to have the manifold off, and not be able to go to vaux to get a stuf you need!
Received the manifold today, and guess what the boss adapter for the Lambda sensor was not in place. Apparently this manifold is now only produced for GTE without a sensors fitted, what SBD have done is sent me the adapter which then needs to be welded into the manifold.
Dose anyone know roughly the power gains that are possible. I already have a complete free flow system fitted. I have heard that from SBD that around 9bhp at the flywheel is possible. (seems quite high)
granted, sbd power claims are always the best case scenario, but theyve had hundreds of hours dyno testing and developing these babies. I would bank on about half what SBD say, could be more if your lucky. Either way, its a similar design to the original, but with bigger diamtere runners and tuned length primary and secondary's. Its gonna boost power and torque over the whole rev range, the exact quantities are debatable, but it is defo worth the cash.
I ran my throttle body setup for about 3 weeks with the standard XE exhaust manifold. I bought the 156 quid SBD jobby second hand from another MIG member. I had the time to prep the manifold with a few coats of high temp manifold paint, and then some vermiculite exhaust wrap.
After fitting the manifold the difference over standard item was immense, i could literally feel this extra kick at high revs. I'm more than happy with mine.
you definately need to paint the manifold, as its not treated when its new and you dont want that thing rusting away on you. You can get high temp enamel paint from halfords quite cheaply, pick up one of their brushes for about a quid too, and give the manifold a good few coats.
I've planned to get the manifold fitted on Wednesday, so if I get some paint and paint it on Tuesday will it be dry enough by Wednesday morning, if not I could try and rush to halfords after work tonight. With regards to the wrap where do you usually buy this from???