Welcome Deadman to the hot street community of Shanghai.
Unfortunately I already left Shanghai but......
Track days: Shanghai Tianma circuit. Track time is so cheap there's no need to race on the roads.
www.stc2002.com you can get the idea although the website is mostly chinese. You can see some track video footage on
www.fightingtorque.com
Underground racing: The police are having a clampdown on it at the moment so there isn't much going on apparently. Also a lot of people tried to tone down the look of their cars by taking the wings off the back etc because of police trouble. It'll come back though in time.
Tuning shops:
www.chinadragonracing.com , another good guy is called Sam's tuning factory
www.samstuning.cn . For English speaking builder of monster Jap rides you need to look for Rob 'The Alchemist'. You can find his email address on
http://www.silkventures.com/performance/index.html
I will forward this link to him so he can look you up.
Honda Civic's : If there is a secondhand civic to be found, any of the guys above might be able to help, especially Sam and China Dragon because they have people in the Guangdong area which is where most of those cars will be.
Cheers,
FT.