INTP is another one I'm fairly close to (although not as much as INFJ). What tells me I'm not an INTP is the level of order in their internal worlds. They describe things like tinkering with machines in their heads and how they use internal, 3-dimensional concept maps that they can travel through at will. My use of Ti is consistent and solid, but it doesn't even begin to rise to that level. Ti is my translator and logical troubleshooter, little more. And, of course, there's also the fact that I don't fit in with groups of INTPs (although I do with many individual ones).
[ Ni > Ti > Fe > Fi > Ne > Te > Si > Se ][ 4w5 sp/sx ][ RLOAI ][ IEI-Ni ]