you would save over a grand doing the swap probably more like 1500 depending on what mods you had on your stock d series engine. ZC is about 525 to 800 shipped and bolts to all the stuff you already have. b16 is about 1100 and up with tranny then you need mounts 350 and up and lastly you need shift linkage. I believe none of your performance stuff you already have will work except your exhaust with the b series. The b16 is nice and pulls nice and sounds cooler but for the price you could get a few zc's or boost one and have a spare in the garage............