yes. Its like .000000000000000002 horsepower gained. I think most of us would see a greater horsepower increase with new spark plugs as they always seem to be overlooked and are designed to fail over time.
I feel differently than most people here. I do believe it helps a little with the Hp gain. Your not going to notice to much only because its on a 2.5. I did mine years back with a header and its definitely noticeable. I have also heard, not tried it yet, if you can get a 4.0 TB from a junk yard and swap over the sensors from your 2.5 TB there also will be a nice HP gain.
If you were to do a 4.0 tb, spacer, intake,5.0 ford injectors, header, and exhaust you would probably get a noticeable difference. But with just the spacer all your doing is making your intake air travel further.
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