i just recently put the stan's 4 inch turbo back kit on my dodge! i was an easy fit, but i had to go back and do some messaging of the intermediate pipe, where it goes around the t case! so if you go with the source kit then you will have to make sure it is right the first time. But i would go with the stan's ships next day!
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89 w250 LE 3 speed auto, boost, pyro, trans, fuel pump tweaked 1/2 turn, fuel pin rotated, 16cm exhaust housing
, 4 in stan's turbo back, k&N and removed air box. Real men's vehicles whistle louder then they can!