i had a NA silvia (auto) and now i have an NA skyline (manual) and my line EATS NA silvias. IT seriously no contest. Off them mark, they can probably hold you for abt 30 metres, then u'll pull away. Ive come up against heaps of Q's with exhausts, T-wings, Rims and rice stickers (wether or not there valid...???) from here to jamaica and they wont go me.
Theres a reason why a NA skyline costs 2-3 times more then a NA silvia....