Originally posted by Jeff_99gs You are going to want to get bigger injectors with a larger turbo. It is really amazing what more fuel does for the engine. My college roommate was stuck in the low 13s on a Big16G with stock injectors. Once he put 660's in he hit low 12s. Having said that, you will need 550 injectors at least. A small 16G turbo is a fine upgrade, as is the BigT-28. With the 16g series turbos you will need a $200 install kit from RRE. You are also going to want a 2.5" downpipe and either a 3" hi-flow cat or test pipe. Upgrading the whole exhaust helps so much with a larger turbo. You will also want to upgrade your intercooler as well. The stock one heatsoaks on the stock turbo. Imagine what a 16G could do to it. Basically, a turbo upgrade should be the last thing you do. All of the other supporting mods should be taken care of before upgrading the turbo. You might be able to get away with a small 16G on the stock intercooler and fuel system for a little while, but don't push the boost over 15psi. When you upgrade the fuel system and intercooler you will be able to see 18-19psi daily.