disclaimer: do whatever you want to your car. its yours and i don't care.
nowadays every tom, dick, and sally has a modified car. to help explain the extent of modification people adopted the name 'stages' or levels. my gripe with this is that there is no standard across manufacturer's to simplify 'staged' tuning. this is why i avoid the later terms when speaking of modified cars. in honesty though, who really cares if a stage 1 dinan car has different mods than a stage 1 cobb car its not a big deal. What is annoying someone saying i have 'stage x' what can i do for more power, or whats wrong with my car its got 'stage x' and runs like a bag of shit.
so when posting please just include a description of your car and mods. it will make things easier. i have no idea what a stage x STi is nor do i care. What would be useful is year, make, model, transmission, mods.
with factory turbo subaru's becoming more affordable, the sea of cheap aftermarket parts, and the inception of open-source tuning it easy to want more from your car. With forums spreading mis-information it is to think you can have all this performance for cheap too. However, these cars are engineered well from the factory and when you modify them it can become very involved. If you think you can throw any old part on your car and have it run like factory you are mistaken. If you think you can throw said part on your car and get an off-shelf remap and have it run like factory once again, your wrong. Off the shelf maps are pre-canned tame maps with the bare essentials to get your car running after to modified it. While they work for the majority a custom tune is recommended.
separately, what is going on with multiple "i have an exhaust and want a tune threads"? Tuning for a stock turbo car with an tbe and misc. parts, is involved but not lengthy. Power and smoothness can be realized but you are still within the constraints of the stock turbo/wastegate/fbc. Many changes are made to the programming but there are usually not multiple re-calibrations, or tedious troubleshooting necessary. There are a few members on here that I have helped out with tuning. BradleyGT, AckAttack, DeadlyDave, Keifer, Bignickbugeye, blufnrckar, darroj, dw0095, Dom, GhettoscoobGC, Red04WRX and HyprBlckWRX. If you need or want help and don't know me or think im a dick, get a reference from anyone listed above.