im not by any means andy f's advisor however..
PPP on an sti, they are aiming for 305ps or around 300bhp
They stick on a prodrive system with a rather tidy sports cat, an uprated fuel pump and an intercooler hose. and a tweak of the ECU
charge you £1995 or whatever. What they dont to when they are finished is check the ECU to make sure you have the figures/result you are supposed to get. hence sometimes.........one PPP might be 315bhp................one might be 301bhp............andother might be 292bhp
So, for the not to serious modder, with concerns over warranty etc it is a good bit of kit in most cases
HOWEVER
The price tag of almost 2k for an increase of perhaps 30-40bhp and more torque doesnt in the humble opinion of many on here match up/equate to the results you will get if you mod it yourself.
A decat system
Walbro 255ltphr fuel pump
Samco hose set for I/C
ECUTEK Remap
£1200 give or take
you just made yourself almost £800 for more mods and got a power figure on an STI of maybe 320bhp?
as i said, im not andy f's advisor, im just gumball
EDITED TO SAY** YOU HAVE AN MY06 SO MY ESTIMATE OF 320BHP MAY BE SHORT