not based on any spec specifically just saying that if you fit an anti surge housing then yes you will get rid of (hopefully but not definatley) the surge but you wont get the benefits of actually getting rid of the surge correctly ,better cam, better exhaust, larger better shaped head ports etc...ultimatley giving more power and torque plus a better breathing and performing engine compared to one that is choked but being slightly dechoked by an anti surge housing which in my opinion is a compromise at best