swigger
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I'm unsure of how the rb25 mounts in correlation to the rb20det - but honestly your wasting your time with an rb20det swap if thats what your thinking I have an rb20det in my z31, it's pushing approximately 365 hp / tq and that is alot easier to attain in any vg series motor ( Cheaper too ) racinjetter might be able to provide you with specs on the xmember.