I just started to do searching on turbo set ups, and from what I have learned we can push our cars to the full gt2871r before we need to change rods (on low boost). Then change the rods if you want to max out the performance on the gt2871r. Anything after that (30 series and higher), then new rods is a must. As for pistons, I read they have seen over 700 hp. But better safe than sorry.
I decided to go bt myself and don't plan on spending $10,000 on mod parts. Those are off the shelf prices. Keep an eye on the cassified and you can get a whole set up for cheap ($1,200-2,200). The extras you will have to worry about are suspension, clutch, tuning, exhaust set up, and labor (if you can not DIY like myself). If you gather piece by peice over time, you could have all done for around $5000-6000 (or even less) parts and labor. That is suspension and stage 3 or 4 clutch included. But if you do all this off the shelf, then yeah, you are talking major bucks.
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