What is the fastest stock V6 import tuner and what is it's 0-60 time?

This depends on a couple of factors. 1st, what is your price range? Because the fastest import for under $10,000 is going to be a totally different car than the fastest import that is under $40,000.
Also, new or used? And before I list a few cars, I would make 1 suggestion. I wouldnt necesarilly rule out 4 cylinder cars. Some come stock faster than many V-6 cars in the same class, and most of hte 4 cylinder imports are going to be easiert to modify. For example, I own a 2005 Honda Accord EX V-6 6MT coupe. I love my car, it is fast enough to be a blast to drive, (0-60mph in 5.9 seconds) but I know its FWD and not a sports car. But, if I did happen to be interested in tuning it, I would find out that there arent many performance products out there for the V-6 Accord, but there are a TON for the 4 cylinder Accord. So although while stock the 6 cylinder is faster, it would be easier to modify the 4 cylinder, if thats what route you are going to take.
So basically, I wouldn't rule out anything just because its not a V-6. I also would not recommend a FWD car. Even though there are some fast ones (Acura Integra GSR, Honda Civic Si, Honda Accord V-6 coupe, Mazda Speed3, Dodge SRT-4, Mitsubishi Eclipse GS-T), and some that handle pretty good, there still is no comparing them to RWD or AWD....

So, saying all that, here is a short list of both older and newer RWD import cars that are either fast to begin with, or are easily modifiable. I will list a few of the 0-60 mph times, but the others will be easy to look up, and will also vary depending on which model, or what modifications are done...
Acurs NSX (0-60 mph 4.7 seconds)
Toyota MR-2 (late 90's)
Toyota Supra (0-60 mph: 4.8 seconds)
Nissan Skyline (0-60 mph: 4.7 seconds)
Nissan 240SX
Nissan 300Z (0-60 mph: 5.5 seconds)
Nissan 350Z or 370ZX (0-60mph; 5.2 seconds)
Mitsubishi Eclipse GSX / Eagle Talon TSi (0-60 mph: 6.3 seconds)
Mitsubishi Lancer Evolution (0-60 mph: 4.8 seconds)
BMW M3 (0-60 mph: 4.8 seconds)
Mazda Miata
Mazda RX-7 (0-60 mph: 5.3 seconds)
Mazda RX-8 (0-60 mph: 6.5 seconds)
Subaru WRX STi (0-60mph: 4.8 seconds)
VW R32
Honda S2000 (0-60 mph: 5.5 seconds)



I would say that brand new, for now price budget the Nissan GT-R is by far the best choice. For a medium budget I would suggest the Nissan 370Z, although the STi and Evo are great AWD choices.

For used with no budget I would suggest either an Acura NSX or Nissan Skyline. Both would be extremely rare, and extremely fast.
For used with a medium budget I would suggest a used Sti, M3 or Supra twin turbo for stock performance.
For a good purchase price to leave room for lots of modifications, you cant go wrong with: Nissan 240SX, Toyota MR2, Mazda Miata.