well you just throwing a turbo on there or a full kit? If done correctly u can get at least 20 hp.
Turbo chargers are all about boost. The amount of additional horsepower will depend on the amount of boost pressure you use. So just adding a twin turbo you can add just a few horsepower all the way to hundreds of additional horsepower.
TRY A TURBO OR A SUPER CHARGER.
Add a turbo to it.
reprogram the ECU (Computer) you could add a turbo
Assuming you are inquiring about a 2004 + GTO ... you can add between 120 and 400+ horse power. It really just depends on you needs (and wants!) and how much you are willing to spend.
How much horsepower does power commander add to 2012 R1
intake exhaust header kpro turbo supercharger
Depends on how many pounds of boost you set it to, but 500-620 if you dont destroy the stock internals lol.
Anything from a better air filter to a less restrictive exhaust can help add horsepower. There are also chips and power programmers that are available on the open market, and turbo- and super-chargers.
5-10 Horsepower.
From 5 to 10 horsepower.
You could swap out for electric fans, you could upgrade the fuel injectors, add a cold air intake, add a good exhaust system, add a turbo.