Broken bolt extraction

[boyer]

Hey, i was hoping someone can shoot me some ideas on how to get this bolt out that broke about 6 threads from being out...

O7 mazdaspeed3. I have a dealer appt tomorrow so i went to swap out my test pipe with stock cat. the two bolts connecting the downpipe to the cat were locked up pretty good, so I wD40'd em and the left came out. the right came mostly out and broke. The only problem is i was using an extension to get at it... an ideas of how to extract that bolt from the flange if its a really tight spot to get to? (can't drill) maybe would have to remove the whole downpipe? i hope not.
thanks

[Shakenbaby72]

they make bolt extractors that you can get at a parts store i go to harbor frieght tools they have some great deals and that should be all you need..

[boyer]

i was looking into them but didn't think i could get in there with them. i just took an air chisel with an extension and busted the nut off the backside of the flange...

[Scott]

So if I read this correctly...problem solved? If not, can you get a set of vise grip pliers in there?