Does any have one installed? Do they actually work? How much hp gain?

im guessing its b.s and doesnt really work.

**EDIT**
I found the same thread in diff section. Please clsoe this one. Thanks

5 to 10 HP loss is about right.

they supposably actually work, but dont do it. its ****ty and they probably last a week anyways. put your money into parts that will last forever rather then that junk.