Put your cheater bar back on, and hit the end with the biggest thing you got, like a giant wrench or another pipe, a hammer is a lil more dangerous because you have to aim... this is the poor mans impact wrench. if its in the proper orientation, you could try kicking down on your cheater pipe as well, same deal.
I've wrecked so many bolts trying to take them out with straight pressure, either stripping or snapping, either option is ******* bullshit when its a 8mm bolt with no room around it holding your ignition coil that you just dicked.