TTI 383/440 2.0" Full Length Headers

Are you "sure" they are TTI headers? Post pictures of the PN if it is stamped on the headers. TTI made two different BBM headers, one set was for the B motor 361-383-400 and the other set was for 413-426-440 RB motor. The B motor headers will work on the RB motors, but the RB headers will hang too low if installed on a B motor.