I got a set used and the $ was not to bad. I don't think it increases Hp at all. It looks good and you can hear the bov and spool much better. there may be a slightly quicker spool up to. it was worth for me since I don't intend to go single and from what I have read the increase performance at BPU from a FMIC is not worth the $. The engine compartment look better and the car sounds MUCH better, look for a used set.
300 with shipping I am told I paid on the high end but Iwas happy with the deal got a few extras like t bolt clamps I also bought some red turbo sillicon hosing connectors from hose techniques to match my paint ..