it all depends on how much you want to spend. if you want a cheap swap either ZC or D16 Signle Cam Vtec. if you want something reliable, either 2nd gen b16 in good condition, GSR, or Type-R swap. I personally would go with the GSR, it's newer and more powerful than the 2nd Gen B16, and it's cheaper up front than a Type-R. so if you can afford it, go GSR, it's a good motor, and your car will run nice and fast as shyt