I searched, and found that I should use NGK BPR6ES which is stock heat range. I thought turbo will need colder ranges?.

Spark plugs, are like beer and oil. Everyone likes different ones.

I had some iridium ones for a while, but they are tricky to gap because you will break off the electrode with the traditional method.

I used to use the 1 range colder NGK's, but I am lazy and gave up with ordering them all the time online and now I just use whatever Bosch single electrode plugs they stock at Autozone. I can't tell the difference. Your gap should be around 30 mills.

The stock turbo DSM's run the BPR6e's stock...we run BKR6e's. Thus most guys preffering to run one range colder plugs, indeed do so by getting the BKR7e's and running gap ranges anywhere from 28 to 34ish.

for turbo I'd use the stock NGK ones or the colder ones -7s

denso has some nice plugs too, but like said before, its easy to break the electrodes when gaping