Don't even think about it. A non-vanos M50 will destroy any other M50 out there with what it has. There is no need to add a vanos unit to the mix. You would have to upgrade the DME to 413, in which the vanos was accepted. You then would need a new MAF, new empty head, new head cover, and so on. You are crazy to even think to add vanos. That engine is built for performance, and if you want something that saves on fuel, get a civic and continue life. I would much rather have a non-vanos with dual valve springs, hotter cams, and NO vanos then have what I have right now, but then again, what I have right now isn't so bad anyway.