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Hi my name is Robert...
What year is your Challenger??
I am thinking a banks set up would give you way more power and it would actually improve the gas mileage, I have met many owners over the years that have them and they are all satisfied with the added HP and increased gas mileage. Assuming you have the P-30 chassis you could do the stinger or power pack they offer, click HERE to have a look, if you are interested I would call them directly, in the long run you would get some of the money back in what you save in mileage plus you will have that added HP..... Hope this helps some, IF you have more questions or concerns please feel free to contact me, IF you are satisfied with my efforts please feel free to select a star rating on the page, it is the only way I get credit for helping..
Have a safe and Happy Thanksgiving.... Robert
Hi... Was just checking in to see if my answer helped.. IF you have more questions or concerns please feel free to contact me..