In other words.
You will not gain power, or loose efficiency by installing a VNT17 alone. That's due to your foot being in the accelerator.
A tune is required to gain any real power, and then nozzles to push it a bit, but then you're opening the bee hive and a lot more mods follow.
I run a VNT17, however, my vehicle is not stock. When it was close to stock(manual swap, unknown injectors, no tune), I didn't really notice any difference, maybe a little laggier. Not really noticeable, and, a little adjustment can pep things up a touch. Not without sacrificing fuel mileage, however.
I believe that the VNT17, from my research is thought to be a more robust turbo and running a stock tune would likely out last the vnt15 given it's properly maintained. This is why I chose one for my car.
Since, I've modified it with a Malone stage 3 tune, egr disappearing act, BMW cyclonic filter, Southbend stage 2dd/ single mass flywheel, BEW lift pump, and swapped it into a 1.8t. The 1.8t has all vr6 upgrades stock(larger brakes, upgraded lower pancake pipe, etc)
Getting ready for the 2 1/2" cat back to replace the gasser exhaust, and I am going to try the Wuzetem p205 nozzles when they arrive. I have been considering having them rated if a fairly local nozzle company/guru is interested.
Pulling a trailer across country I was 65 - 70mph averaging 42mpg, and running 70 - 75 to Florida and back to NC I was running 47mpg. I have had it up to 54mpg at one time(Ohio round trip from NC), and I believe I will again soon, with new injectors and calibration.
And I have no regrets.
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