They are ok.
It will basically get a KN filter on your Quad and put the Carb settings leaner to accomodate it.
They are not bad.....but better throttle responce is the main thing you will feel.
Do a Slip on pipe, KN filter and Jet accourding to the Pipe Mfg.
That is a good start for more power (Thats noticable).
Crusty