Downpipe question 2 pipes or full open neck
 

Hallo

Can anybody say how much difference it is from the turbospool between this downpipes?

I want to make this at my serie downpipe! like 2 pipes

http://www.japspeed.com/media/images/popup/794.jpg

and a full open neck downpipe?
http://www.toyosports.co.uk/ekmps/sh...pipe_decat.jpg

Iv had both styles & I believe the one with 2 pipes to be better for spool,but full open neck to give more power. I run full open pipe now & I prefer it.