SRT4s are fast anyway especially when they are modded, there will always be a car faster than him, but if you wanna get his numbers up there I think you can do a decent job before you even have to change the turbo for a bigger one. And if you get all this done, and he still wants more, he wont need anything to upgrade the turbo all he'll need is the turbo and software. Heres the list:
1)Exhaust
2)Downpipe
3)TP
4)Nuespeed TIP
5)Samco Boost hoses
6)Software Chip(W/ Bigger injectors) (Probably Revo Stage 2, so he wont have to switch software if he wants to upgrade the turbo, since they have better software for turbo upgrades, and he could just pay an upgrade fee. Thats if he still wants a K04 or something after all these mods)
7)FMIC
8)DV
9)Southbend Clutch
10)Short Shifter
Alot of racing and racing times depend on the driver as well, if he really wants the best time he has to drive that car hard. I know a guy who is a great driver, was showing his friend how to drive on the strip, got a stock si in the 14s after a bad launch just by amazing shifting, the owner was getting mid 16s. You also have to keep in mind this guy has broken many shifters from ripping them shifting so fast, but when he has the right equipment and does it right, it's the difference between SECONDS on the track with him and an unskilled driver. Thats why his clutch and short shifter will be important in this.
If he has all those mods above, I think he could be around 250hp w/o the turbo upgrade. That plus the southbend clutch will be great for good launching, and the short shifter will do him good. But he has to learn how to drive hard too, like in the example above, it can make a real good difference. Of course, I dont know how much money your son has/is willing to spend, but the list above would be ideal before dropping $1500+ more on a K04 upgrade.
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