I currently have an s13 blacktop, stock bottom end and built head with hks 272. Was wondering if it will be ok to drive this with stock set up (t25 turbo, 370 inj. stock mafs) with out a tune? I have other parts still needed to be installed such as gt30 turbo, 740cc injectors and z32 mafs but still looking for some kind of standalone or maybe power fc. Would it be safe to drive it as is for now or would it be a bad idea (havent started the car)? need some SR expert's feedback..

No one?

Yes you will be fine. The only thing I forsee happening is you might max out the maf causing an early ”rev limit”. Id keep boost low and you should be fine to rev limit but more than stock boost with cams will indeed max out injectors and maf. Cams with no tune will add fuel and subtract timing so a tune later on to subtract fuel and add timing to compensate for the cams will be veridical but id do the z32 maf and injectors all at the same time with the turbo upgrade.