I think, but not 100% sure, that TR5's are the same heat range as stock plugs.
TR55's are 1 step colder, TR6's are 2 steps colder.
If I am right then you'll be risking detonation and at the very least you'll eat those plugs up in no time (like I did when I ran Autolite copper plugs that were stock heat range).
I would suggest TR55's at the very least and TR6's if available.
Run premium (91+ octane) gas.
