It really depends over what distance you're dragging, as stated before.
For shorter drags I use several cars, depending on what's already been brought into play: Tommy Kaira ZZII, HPA Golf, GTR Concept (Tokyo Motor Show version, with the stock automatic transmission) and even the 4wd Mazda Atenza (I forget which version it is, but it's got 550+ bhp) Over the shorter distances I've managed to beat Veyrons with the GTR Concept and Tommy K! (Admittedly, that was more likely down the the lack of tuning ability of my opponents, but a win is still a win!)
For tunnel drags though it's a different story, as the "short burst" approach won't help you at the end of the tunnel. For this, I use: Le Mans Quattro, Nuvolari Quattro, Shelby Series 1, Mercedes SL600 or Nissan Option Stream Z. All of which launch pretty hard and have a good top end, you have to remember that a decent tunnel run will last over 30 or 40 seconds, so your top speed needs to be tuned in as well as the launch.
Most of all though you need to make sure you've tuned whichever car you choose to the absolute best it can be, else you will still get wasted off the line, even if you're using exactly the same cars.
Quick Off-Topic question: How do you regulate/control the start of drag races in this game? Since there isn't an official tree, I'm curious how this is done.
Normally someone designates a "seconds" in the race clock as the go time. Messages in rooms such as "05" etc are what you're looking for.
