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The power it adds on gas engines depends on your set up, If your getting detonation and loosing timing then you see bigger gains, But even with with a small nozzle you will notice a faster spool time for your turbo and lower intake temps which gives you full timing and added power.

If you add boost and timing your gains will be greater. A stock SRT-4 normally pics up around 22hp with our kits with no changes but every vehicle is different.