Upgrade for sure. You won't spend much if any more for an upgrade. You can't go wrong with a TA49 or 33. Near stock spool up with a very good increase in top end. Don't forget our turbos are smaller than the IC guys so it does make a big difference even with a small turbo upgrade.
well..I spoke with a bunch of Gurus last night, and I am leaning torward getting a TA-33...I dont like the idea of mod-ing the turbo to intake adapter, and I dont wanna go to big with a 49 because of knock issues...on a 33 turbo what kinda HP increase will I see?
Stock injectors will go low 12's, so don't worry about them. You will have knock problems with any turbo if you don't have good octane. If you are running high boost and low octane, you are asking for problems, and more fuel insn't the answer, you will just end up with a slow spooling slug at high boost. I wouldn't bother with the 33. Get a 49 in the stock housing, run 22lbs of boost and 100 AV gas, and hold on. Make sure you get a chip for the larger turbo, or else you will experience a very lean condition. I don't see why a 49 wouldn't spool with a stock TC as long as you have a Garret .63 housing, not a PTE .63 which is actually .77.
I have firsthand experience with a 49, 62, and 64 turbos. The 49 will work fine with a stock convertor. You won't be able to get away with the car being pig rich on the bottom end or exhaust leaks like you sometimes can with a stocker. As long as the car is running good and tuned you will notice very little difference in spool. The 49 can supply more air than the stock injectors can supply fuel but unless you have other mods you will be fine.