The injectors on the rail are 06A906031BA would they be different to the stock ones on the APP engine?
EDIT : Looks like they are the same
https://www.onlinecarparts.co.uk/bosch-1150389.htmlInjector (BOSCH)
Fuel Mixture Formation:Petrol Injection
Static flow rate at 3 bar, medium N-Heptane [g/min]:217
Resistance [Ohm]:12
Engine Code:APP, AUQ
to construction year:12/2000, 04/2004
from construction year:05/2000, 09/2000
from Chassis No.:1M..Y..100 001
OE Numbers
Proceed to comparison by OEM number
AUDI OE-06A 906 031 BA
SEAT OE-06A 906 031 BA
SKODA OE-06A 906 031 BA