about how much hp and torque does an 87 audi coupe gt turbo have?

 

Doesn't sound like a factory production Coupe GT. The HP depends if it was modified or not, 10V or 20V motors? The stock 10V is about 165hp, the 20V is about 200hp and with some mods can go as high as 400. Rumor has it that Audi had a 1000hp motor for the Group B Rally cars back in the late 80's before some unfortunate events forced the end of the B class era.