How much HP does a twin turbo LS have?
At less than $20 per horsepower! via
Can you put a turbo on a stock LS motor?
Yes, you can make big power by throwing boost at a stock LS engine, however, if you want the horsepower party to last for a long time you'll need to make some changes to the engine. The stock components just can't deal with the stress that forced induction can put on them when you really start to crank up the boost. via
How do you set up twin turbo?