How to increase bhp of engine?

Answer 1

There are three main areas you should focus on and decide how much you want to do.

The intake and exhaust of a car are the easiest components to change and/or improve. They are also the cheapest, but you should expect no more than a 10% increase in power.

The mechanical engine parts are where you can get real power. A turbo will get you the biggest power gain, but will reduce engine life and you will have to adapt your cooling system to cope with the high temperatures. Your car's engine management system will have to be remapped and it'll have to go onto a dyno for further tuning. A turbo could give you a power increase of 20%-50%.

The electronics in your car (assuming it has fuel injection) can be altered by putting in a "chip". This will remap your engine management system (as above), but your car will also have to go onto a dyno to be tuned. I'm not sure of the power gains.