shark injector or sprint booster
 

Are these any good ? Which one is better? How much hp do you get from the sharkinjector? Also the sprint booster. Which one would you recommend.

Try Search Tab; topic is beaten to a pulp...
Here is a Page of Threads on SB:
Xoutpost.com - Search Results

And, here is a page with at least 6 Threads on Shark Injector.
Xoutpost.com - Search Results

Nothing has changed, from when all those threads were arm
wrestled, imo.
GL, mD

As MD says, both have been discussed quite a bit.

The Coles Notes version:

The shark injector is only for the 3.0 six cylinder, and claims 2.5% increase at 6000 rpm. They claim about a 1% increase at normal driving rpm. You would never notice either increase in the real world.

The Sprint Booster doesn't claim to increase power, although there has been some confusion about that from some posters. It changes the mapping of the accelerator pedal to give a different response, which some drivers like.

If you have a 3.0 and want to increase power, the only real way to do it is with a supercharger kit, and that costs $$.