Just keep boost at 15 psi or less...
If you are a creative DIY'r, with a bit of screwing around, you can use all the stock piping, and lines.....
For the longest time, I ran the 20G with everything stock, except K&n and muffler. I didn't get full potential out of the turbo, and didn't need massive supporting mods.
If you have a 3" turboback exhaust and UIC pipe, things will flow a lot more, and all of a sudden that turbo starts to work and then you need more fuel. After I added the 3" turboback, I started overrunning the 1G maf, and at over 15 psi, things would get very lean. Dangerously so....
So then I got the supporting mods. Kind of a reverse upgrade path, but if you are sensible, you won't do any damage.
Actually, thats how I started. Shortly after I got the car, I realized the exhaust turbine housing had a huge crack in it, and figured I would replace it. SO....thats how I got the 20G before ANY other supporting mods. Do I regret my upgrade path? Not on your life. :twisted:
Just remember a 20G flows quite a bit more than a big 16G. Its worth the difference in price.....in my power-crazed mind, anyway....