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Old 10-12-2014, 12:14 PM   #1
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Straight pipe horsepower increase?

I do not have a cat on my 66 mustang but I want to take off the muffler. I heard that taking off the muffler increase horse power but is that still true without the cat?

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Old 10-12-2014, 12:21 PM   #2
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Yes, it's true. But without tuning the engine for the increased air flow, the gain will be hardly noticeable. Even with tuning... Barely noticeable.
It will, however, make your car louder.

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Old 10-12-2014, 12:32 PM   #3
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Please remember to post in the appropriate section. This should be placed in the Classic Mustang section. I'm moving it there now.

Also this is the third thread you have made in a few hours. If you have multiple questions just ask them in the same thread.

Faster than a speeding...............
2001 Bullitt being prepped for track duty
Corners > Straight line

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