hi guys been looking at replacing the down pipe on my 1996 sti but not sure what to go for im running a 3 inch blitz nur spec R exhaust system so im looking for a 3 inch down pipe but what is better a bell mouth or the style that has a second pipe for the waste gate of the turbo ?

Peter

 

Open bell mouth is best

 

I would go for open bell mouth as well (Hayward & Scott)