Hello forum members,

I have a LPG - Viale LPi installation in my 2007 9³ SS 1.8t
It has the tank+pump assembly instead of the spare wheel.
Strangly now the back of the cars saggs, like weak springs or heavily loaded.
Except that the weight of this LPG assembly merely meets that of one adult person.
And the cars is provided with 3 seats in the back ???
Many adviced me to put stronger springs, like for a trailer,...

now, I found on my original rear springs a label:
P127567-17 AG1

Hence my question that last number seems a ratification?
Could there exist an AG2 - or even AG3 aswell ???
Signifying a stronger spring rate.

Hope someone could help me out with this, to my knowledge, yet unreported issue.

Best regards, Harry_Satch.