eight hp
5 to 9 horsepower about 7 horsepower i felt a big change of horsepower in mine
Maybe 10
aftermarket intake (K&N, for example) and aftermarket exhaust system are the two easiest ways. you could also... install a turbo or supercharger use a 'powerchip' type computer upgrade
3 to 8 maybey 10 but not likely
about 5 - 10 hp
God, where to start? there are a LOT of things you can do to add horsepower. How much money are you looking to spend? here's a list of things you can do: cold air intake, swapping exhaust manifolds to headers, changing to a high flow exhaust system, turbo/supercharger, nitrous, aftermarket computer chips, lightweight camshaft gears, bigger camshafts, bigger engine, aftermarket clutch, aftermarket torque converter, etc.etc.etc.etc. There's a helluva lot you can do. It's all in how much money you wanna spend. Agreed. LT headers/cold air intake/catback/tune REALLY wake these bad boys up though
cat back? 12hp/12ft-lbs.
Not enough to even notice.
Not a significant difference all the dual exhaust does is cut back pressure ergo the louder sound
by itself, not much, not enough to notice, if you go with a performance carb and air filter as well as the exhaust you will see a lot of difference.
add intake chip from eBay and put an exhaust.