But really... PB blaster only goes so far... If you want to loosen bolts, make what NASA uses... 50/50 mix of acetone and ATF in a spray bottle is all you need, especially if you can let it sit a while. Will loosen almost anything! Breaker bar helps if stuck
Personally, Plog is half a set of headers and why not just go all the way and get headers! Just sayin...