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Author Message   Burckman Posted on Wednesday, May 18, 2011 - 07:55 pm:        03 engine to 07 was quality an issue with 03 motors. thinking of putting an 03 in my 07 xb9r firebolt. thanks   Froggy Posted on Wednesday, May 18, 2011 - 08:17 pm:        Quality is about the same. Big difference you will notice is that the 03 and 07 have different transmissions, and as result the 03 will be stiffer and harder to shift. The oil pump and gear is better in the 07, you might want to steal that out off of the 07. Also, the 07 has a larger throttlebody than the 03, you might want to swap that too!   Burckman Posted on Wednesday, May 18, 2011 - 08:42 pm:        So the oil pump will swap like for like as well as the throttle body. Appreciate it just trying to look at all my opptions thanks   Al_lighton Posted on Thursday, May 19, 2011 - 09:49 am:        If you use the 07 ECM, you definitely want to use the 07 throttle body. Totally different mapping. Al

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