Replacing Exhaust Manifold?

I have a 1991 Ford Ranger 2x4 with a 4 cylinder. Would it be worth the money to replace the exhaust manifold for a less restrictive one and hopefully gain a little more HP? Or should I just not even waste the money.

Also do you have any other suggestions on how to squeeze a little more juice out of this tiny engine?

http://www.therangerstation.com/

Headers just rob the motor of low end torque. You may get to go 10 to 20 mph faster top speed. It's a waste of money. You might gain 10 to 15 hp with a cat back exhaust system. Cold air intakes are also a waste of money and can ruin a MAF sensor.

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