I guess my earlier post was eaten by server gerbils. Curse you, Server Gerbils!!!
Anyways, earlier I said that the term "reliability mod" was oxymoronic, but there are a few things I guess you might call "reliability mods":
1. Proper maintenance and repairs with OEM parts, except as below:
2. Intercooler hose T-bolt clamps: the stock worm gear clamps can and frequently do work loose over time, leading to boost leaks. Cheap and worthwhile safety mod for any car.
3. Silicon Intercooler hoses: older cars have plastic hoses that can crack with age. 3rd gen cars have an intercooler design prone to cracking. Silicon hoses are great if you have cracked OEM hoses (like I did), but unless you have a boost leak, as proven by logs, I wouldn't bother. A cracked intercooler can only be replaced. Process West makes a popular one. This seems to be happening on the new cars at Stage II power levels.
4. 3rd gen cars seem to have more leaky BPVs at STGII boost levels compared to older models. A top quality Bypass Valve (NOT blow off valve!!!) may be needed. The Halman Pro RX is a name I've heard good things about. Consult with your tuner.