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Cutoff - I put mine on the firewall at the front of the transmission tunnel, my battery is over the passenger footbox. Yours should be fine where proposed, keep the cable short, and most tracks require it on the positive cable. Things to consider: Can you reach it with your harness on, mine has two posts but if you want it to kill the motor when you turn it off four are needed - the car will run on the generator if you don't break the generator or ignition circuit also, cheap ones have ended up with the contacts welded together - so get a good one - FR seems ok, do you want a removable key - nice for security but if it is in view and you leave it in the switch someone could steal it and strand you. Mine is most useful when working on the car - kill almost all power without pulling a battery terminal.
Header - most side pipes have a mount after the muffler and use the header as a front support, so it has a lot of stress on it from motor vibration and road g-force. If yours has no rear support the problem is worse. Sheet metal screws will probably enlarge their holes from all the flexing, and eventually come out. A hot cam or soft motor mounts also don't help - I had to use a semi-solid mount to stabilize my motor or the pipes would not have survived, and they have heavy flanges. May want to see if a muffler shop or machine shop can make and install a pair of flanges so you can have a sound connection and change the side pipes easily.
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