My son has a 2005 Saturn Ion 2.2 Litre and wants a performance exhaust., He is curious as to whether or not the GMPP performance cat back will bolt right up.(part number 17802111) It is meant for cobalts, but if I am not mistaken are the Cobalts and the Ion not on the same chassis? If so, does he need to change the Manifold and downpipe also due to different pipe diameters. Any insight would be greatly appreciated! Also has any one done this ?