just doing a little more research on this, whats the pro's and con's between the siemens & the grey's..??

I noticed on Stu's listing he rates the siemens from 360-380 an the greys at 380. Also the listing with the greys specs a larger I'cooler where as the siemens does not..??

my current spec is; 2WD with 1mm bore on 200 block, T34.63, FMIC, stock cams, 803 injectors, MSD chip to suit, swirl pot and breather etc. Running around 20psi at the mo'