sometimes ther isn't enough room under the bonnet for turbos so compromises must be made. I tune an XR8 ute that had the turbos mounted under the tray behind the cab, he purchased a complete kit to mount them under the bonnet and when fitted up there was no room to run dump pipes out, so he nearly scrapped the idea, but decidied to mid mount them and suck it and see, he was expecting to be a bit laggy, but it operated great, 365 rwkw @ 8 psi and consistant run after run.