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Hi All

I'm after some help with upgrading my 99 HSE 4.6ltr.

Primarily I'm wanting to know the best way to make it more fuel efficient, I've spent alot of money on bringing it back to running like new but it still is thirsty! I just changed the air intake box and filter for a racing hog pod filter which has made a big difference already about 35-40% more efficient. Was getting 18-20ltr/100km now with new filter 12-14/100km.

Question is would I benefit from upgrading exhaust system to say 2.5in direct system with cross flow or increase HP to get more grunt ie giving it more power/torque to weight.

Any help much appreciated :D
 
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