That's ********, frankly!
A K04 will flow 280+ if maxxed out on optimised manifolds, inlet piping, far better (more efficient ICs) and possible injector upgrades.
I can't remember the values, but in theory, a K04 could flow 285 BHP at it's maximum...I think ChriS3 has the figures to hand and may be able to assist here.
280 is possible...I'd not care to say for how long...but it's do-able.
A standard a K04 can be made to flow 280ish (certainly 275+) whilst holding over 1.25 bar to the redline - but it's adding soooooo much heat thet far more afficient ICs are essential.
If you log injector on times on a car in this spec thay are *just* safe...ie, they are bearly having time to switch off before being switched back on again.
So, you need far better ICs, the K04 running flat out with virtually no boost control at all, optimised TB, optimised boost pipework and an aggressive fuel and ignition map...but you can get 280BHP.
It's not easy...and you need to carry out pretty much every tweak you can think of to get cumulative gains...
My old S3 made 1.98 bar peak boost and held approx 1.25 bar to the red-line and made 332 lb-ft and 275 BHP on a reliable/conservative dyno.
When the next owner had it, he added a 'boost machine' to tailor the boost curve and it ran 315 lb-ft and 282 BHP.
Now...275 (or in my case 274.5) BHP calculated at the flywheel was 214 BHP at the wheels.
The same dyno where it made 208 BHP / 199 lb-ft standard (spot on)
The same dyno where my Golf GTI made 150 BHP standard (spot on)
The same dyno where my standard 911 makes 320 BHP (spot on)
The same dyno where my S3 in it's 1st stage chip made 240BHP/250 lb-ft (spot on I'd say)
The same dyno where certain other tuning companies S3s claiming 270BHP / 300 lb-ft were actually making 250+ BHP and 270 ish lb-ft.
The dyno is pretty accurate.
This S3 has been running at stages of tune between 275/332 (All my tweaks + N75J), 280/315 (David R spec with a 'boost machine) and 270/310 (high-boost map and std N75 - no 'boost machine') for about 4 years now...and it's still going strong (very) and makes the numbers on any rolling road you care to point it at.
So pardon me if I think your comments are ********...
It's been proven time and time again...