btw it can be done my way if you're strapped for cash, but since you're talking s3's (make sure you get the RR versions), you might not need it. otherwise my way works - make an adaptor plate with two 5/8" nipples, one post maf, one to the IM and that will do the same thing as putting a whole new im on. You just have to trace your lines to make sure you're putting in the correct area.
*edit* forgot to mention, when you're clamping the unit down with nuts, wire up a ground from the unit to the IM someplace - I am not 100% sure, but I think I may have fried some wires by not doing so, after grounding them and fixing the wires, badda bing