do they help ? do they help in the low end or mid to high ? do i have to retune if instal ? and where is best place to instal them ?

 

The best placement is after the 02's and before cats if you have them. I have mine right after the header collectors. Retune is not needed since it's after the O2's but I do see my AFR lean out by up to .2 when open.

 

o ok il try sum

 

it is suggested for cutouts to be installed about 1ft after the 02's..... I have a ORY pipe, and I only have one cutout and it is just before the muffler...

 

thats the way mine is...although it serves no purpose there besides to make noise

 

If it's just before the exhaust reaches the muffler, it sure does serve a purpose. It opens up the exhaust for better flow instead of backing it up in the muffler. It's been working for years. Why doesn't it work on yours?

 

i have a straight through muffler and it dumps right at the muffler...can't get much more open