If I was on a GT28 I wouldn't care about W/M.. K04 or K03 is a different story. They just blow nothing but hot air after 4-5k, which is really the only reason I'd care to run W/M. If I went with a bigger turbo it would be last resort. I understand what you're saying about just one turbo, but I'm not ripping out a turbo until it's really done. until then, party time!