I'm not in the US and I don't live near a big city so the usual big power V8 swaps are impractical for me and 400 whp would be fine. Which means that a supercharger swap may be more viable I guess, SRT's are stupidly priced here so forget that option. A V8 would still be great so I'm wondering if a transplant from a R171 Mercedes would do but the Xfire is R170 based so compatibility rears it's annoying head and they are under 400 whp. Basically I don't know what to do if a Xfire is the project car of choice.