simon,if you can remove the other bolt holding the manifold on you may be lucky there might be enough of the old studs left sticking out for you to get a pair of mole grips on them if you find there is not then try this, you need a stud extractor kit this you might be able to higher from the higher shop or local motorfactors the kit has a number of special drill bits in it with the different sized extractors full instuctions come with the kit good luck
alanmellor
May 2006