25 rwhp ish, they can be a bitch to tune but seem to make the car much more responsive(it revs fast). The car pulls hard up 7,000rpm and they sound AMAZING:rockon: On 17lbs and pump on two dif dynos it made 637 rwhp and 629 rwhp. Guy who owned it before me ran it in GREAT weather and trap 135 on pump. My best trap on 19lbs and race gas was 135 but it was 80+ deg out that day.