i called HKS the tech there told me to use a stage 2 272 duration cam for 350-400 whp. the turbo im using is the GT28RS. i think that i should use the 264 Duration for low end power?

 

The only Diff between the 272 and the 264 IS the duration the cam lift and the valve lift are the same, you will not really be able to tell the difference with such a small responsive turbo like the GT28RS the 272's will open it up a little more top end but I doubt you will be able to tell the diff. I went from HKS 264 stage 2 on an S15 turbo to 270 Tomei Procams with a 12.5mm lift and that was barly noticable but I did shortly thereafter change to a TD-06 25G turbo. I would just get the 272's since they are no different in price (well at least in japan they aren't)

Just for reference

http://www.hks-power.co.jp/products/...haft_data.html

 

thanks for tha info