ill just say that i had stock injectors and wanted more power, so i had the chance to pick up some JL Machine 5x18s for my 12V. So i put them in and figured i'd baby it.
First Problem- Lift pump couldn't keep up (had to buy $500 AirDog)
Second Problem- Very undriveable unless you have a remote controlled foot (too surgy with a 35)
Third Problem- Didn't have head studs yet ( Headgasket= KaBlooeeii!!!)
Fourth Problem- If you go past 3/4 throttle you can peg a 2000* EGT gauge
Fifth problem- hasn't happened to me yet but 9712valve had his compressor wheel shoot out of the turbo, break the housing, and then proceed to take out everything in between the front of the engine to the air just in front of the grille.
My opinion- wait til you have the supporting mods to install them regardless if you buy them or not. if they are a good deal, and you know you want big power down the road, go ahead and buy them and just set them aside until the right time comes. just my $.02