from my search, 280's are not really for stock turbo.

264 is more for daily driver that wants regular idle, upper rpm range power, and there are variations on how you could suit your power needs.


intake / exhaust

264/264 - high rpm range power, not much on the 4500rpm and below : idles like stock.
272/264 - real good low rpm range, nothing in the middle, bit of top end: idles like stock
264/272 - mid to high rpm range power from 4500rpm on: idles like stock
272/272 - high rpm range power after 5000rpm or so : idles like crap. need cam gears.
280/280 - uh... useless if you use it on stock turbo. Wont give you much power from what I've read. Unless you have your rpm set at 9000rpm with 20g tme or gt3071R or up.

correct me if my info's are incorrect.

 

280 cams are great up top and they do make more power than 272s. Just ask Buschur.