Dumb Question.

[ArpusTT]

Uhh...Where are you guys tuning your cars in GT5? I see no option for tuning anywhere in the prologue...

 

[GTPorsche]

You don't get the option to tune cars until you reach the S races.

 

[clacksman]

Yep, Quick Tune is unlocked once you clear through A class offline.

Or, if you're lazy, grab a gamesave from this thread:
https://www.gtplanet.net/forum/showthread.php?t=104303

 

[ArpusTT]

Ah! Thank you! Damn another reason to go get my ass on GranTurismo.