Easyout for the bolt will be fine...heat would be better if you have enough to grab onto...Im assuming this is why the smaller bun muffler was fited im guessing. If you havnt used an easy out before,just make sure you step up the drill sizes gradually and get the first drill on centre.(Tungsten Bits are better if you have themthey are like going through wood...EASY.) I use them quite often,but I nearly always get them out and run a helicoil thru to make it stronger. since it is only a 1/4 bolt you might even be able to tap it out once youve drilled if you can get it perfectly centred and not have to by any extra tools,and make sure you re tap the hole before fitting the new muffler.....As for the Tacho,never bothered with one,too costly for one off jobs and your ear is just as good
. And I think in a previous post i stated i had an air cleaner assy,If you want it its yours.
