I have bought about 19 different engines from J&J motors and to this point only one in their motors has ever damaged down on me, and hat was immediately after about 6 months use. They were swift to sort it out and have me a substitution design, below their guarantee. https://httpsjdmengineforsalecomp43197.wikicorrespondence.com/4675034/an_unbiased_view_of_https_jdmengineforsale_com_product_jdm_mazda_rx_7_fd_13b_rew_engine_for_sale