yea the 2010 is ugly in my opinion, and its down on power, but still a very sorted out platform. Speed6's are hardish to find, but Speed3's are more easily availiable because they have been made for longer and more were sold. The Speed6 was approximately $50,000 Canadian when they first came out, while the 3 is more affordable.
Direct Gasoline injection is different in that on a traditional multiport setup(like on the Talon) there are injectors that spray on the back side of the intake valve. This only needs 30-60psi pressure. But it can condense/puddle sometimes and has some timing issues compared to DI. As well, at high rpm, in order to get enough fuel in, the injector has to fire for a long(relative term) time at the back of the closed valve and therefore its a puddle of gas that has to rely on vacuum to atomize it, like in a carb setup. it works, but its primitive in terms of emissions and economy, as well as controlled burning.
With direct injection, the injectors tip is INSIDE the combustion chamber, just like a spark plug. Fuel pressure is between 500-2000psi(for the most part) Emissions, throttle response and fuel economy are greatly enhanced as well as power and torque.
detonation is much easier to control because you don't have to spray fuel before its needed. With a traditional engine, the fuel is sprayed, then the intake valve is opened, so there is fuel and air in the chamber on the compression stroke. This can ignite prematurely.
On a DI engine, the fuel is sprayed at the last possible milisecond. Until then, the compression stroke is only compressing air, so it can't preignite. Now, this doesn't work perfectly as when the engine speed is high, you have only so many miliseconds to spray fuel, so you have to start spraying earlier and earlier into the compression stroke. But as we know, its at low-mid range that knock is harder to suppress anyways, so it pays bigger dividends here.
Plus you can do things like stratified charge spray patterns etc.
It pays off, as the car is 9.5:1 compression and just under 16psi boost from factory. And while it doesn't get econobox fuel economy it gets very good mileage for a 3500+ lbs car with awd and a powerful engine.
The downside is that the fuel pressure is very high, the injectors are not upgradable(yet) and ungodly expensive, and it has 2 fuel pumps. Plus the tuning world is still in its infancy when it comes to setting this stuff up, but they are catching up.
Volkswagen and some others are using similar systems to good effect.
Diesels have been direct injected for a while now, also with great benefits. All the new domestic diesels are rated at over 600lbs/ft of tq stock, with direct injection being a major contributor. And they are cleaner and get better economy, while being quieter and smoother.
