I have all ways known that back pressure during low RPMs is good but not during high RPM operation. I have searched on here and seen posts that talk about this but no knew where to get something that would do this.

Would this work?
http://www.ultrafitexhaust.com/newprod_turbo.htm

It's a valve that stays closed during low RPM and starts to open as RPM gets higher.

Just curious if this would help anything?

 

This has been covered before. I know becasue I asked.

http://www.teamsr.org/UBB/ultimatebb.php?u...t=002244#000000

I'm going to put one on my Elantra when I redo the exhaust.