Hi All.
The last couple of weeks I've noticed that my Coupe will sometimes idle roughly on startup, or stutter when accelerating. This has only happened a few times but I took it to my garage today to get it checked out. They checked plugs, leads, air filter, vacuum, all fine. Got to the exhuast manifold and they found 2 small cracks .

Garage are saying that the cracks could be to blame for the odd rough idle due to the manifold being near the lamda (sp?) sensor. Is this right?

How much would a new manifold be? I've read somewhere that the manifold also includes the Cat so I'm assuming it'll be £££?

PS. I read the sticky on the TPS but I don't think this is to blame as it doesn't go rev 'hunting'. Oh, and its a 2.0L F2

Any help would be great

Cracks in the manifold are not good, they reduce the backpressure and cause loss of performance. Not sure if it would cause a rough idle though, I guess it may if they were bad enough...

Your options for the manifold are:

Repair (weld) the old one - Cheapest option but not long lasting.
OE Manicat at around £400 - will be a direct and no aggro fit, is costly and offers no performance upgrade.
4-2-1 manifold, universal cat for circa £350 - not a direct fit, will require modification to your existing system to fit. Will give something like 15Hp extra (more with an aftermarket exhaust) and looks class. No further cracking issues...

So there you go, you pays yer money etc etc

id be looking aftermarket tbh