Yeah, that sucked. Didn't have a tow rope handy, and when I got one from the pits, it was too late. It wasn't busted, they just didn't have any ether handy to restart it after the pull.
On the tracks around here there have been quiet a few different trucks trying different turbo's out some with luck and others down sized or changes exh housings.
Large single comes down to charger, tunning, fuel. Twins are more forgiving but can be hard to control drive pressures on some of these home brewed twins people are trying to run. Actually I seen a couple of these home brewed setups fall under just as much as a bad large single setup.