How effective are underdrive pulleys? 2009 Ford Mustang GT?

I have a 2009 ford mustang gt and I'm simply trying to gain power a piece at a time.

My question is, how effective are underdrive pulleys?

I currently have a cold air intake with in hand tuner, 4.10 gears, and aftermarket mufflers… Any information would be greatly appreciated.

Just one more example of "A fool and his money are soon parted."

Underdrive pulleys are stupid for the street. Worse cooling, worse alternator output, doesn't sound like a good combination to me!

Your bolt on mods are almost ineffective. You'd be better reducing the weight and taking driver training if you don't want to tune it properly.

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