Trucks got 190k on it, spend all its life with my dad in CT winters. bolts going from cats to the y pipe, or what ever its called are rusty looking cones and not Hex heads anymore. bolts coming off cats to heads look to be pretty clean. I was told I would need a Torch to heat them up or I may break the studs? Is this correct? I did find a YouTube on changing these but it was on a Pilot which im sure is a same to similar method. Any tips?