Can anyone advise me on how I can increase the horsepower of my
1990 Mercedes-Benz SL300.
It's a fantastic car but I need more power.
Answer : With a car of that age and unknown mileage, I
would not recommend anything drastic.
Firstly, you should get everything back to spec, i.e. the
valves adjusted properly, pistons and rings in good condition
and no excessive wear mechanically.
Then, if you need more performance, I would suggest a low
boost turbocharger system that would give you an increase in
performance of about 20 percent without putting too much strain
on the engine.
There are some shops doing turbo systems in the Klang Valley
who should be able do this for you at reasonable cost.