They do help some. They are proven to give ya some hp and torque, but also look good if you are into the show scene. They play a part in both catagories. As far as Horsepower per dollar goes, then its probably not worth it but I/H/E is the 3 things to start with when moddin a car.
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2008 Mustang GT
1998 Hatchback SOLD
1992 Hatchback w/ JDM H22A SOLD
1985 Ford Bronco XLT 5.8 351W
w/ 33X12.5X15
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