I know IPP has a built longblock that will handle it for $9k or so, but the motor is a small part of the overall cost to get to that power level. Most people here stop at the 500-600whp level just because you have to drop $15k+ just to get a reliable turbo setup on a stock block. Adding another $10-15k on top to get to 700whp is a big commitment. It's not just the motor. Everything is more expensive when you're trying to hit those kind of power numbers.
You can make whatever power level you want with a single or twins, you just have to pick the right turbo.
You'll also need a reliable daily driver. I drove my TT Z daily for years. Even though it's very possible to have a highly modded car as a daily driver, there will be times that it's down for maintenance and broken parts. With a stock Z, you run to Autozone and knock out the repair. With a turbo Z, you order parts online and wait a week for them to show up.
Insurance has nothing to do with any of this. Some companies may be willing to write you a rider for the aftermarket stuff, but I'd always be worried about telling my insurance company I doubled the power of the car.
Last, how did you get to the 700whp number? Are you familiar with driving high-hp RWD cars? If not, don't just jump straight to the 700 club. A 500whp Z is shockingly fast. A 700whp Z is nuts. You're going to have traction problems. You'll spin all the way through 3rd gear. And if you make a mistake with the throttle, you'll be leaving the road backwards at high speed.
The other thing to keep in mind is that pretty much every dollar you spend on the car is a dollar you will not get back out of the car if you sell it. People usually don't buy other people's projects, and if they do they don't pay top dollar. Many people have boosted their Zs to find out they could have bought a pretty nice used GTR and had change left in their pocket.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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