I saw the u are from Delhi.. Can u give a a rough estimate about how much a good quality Sbgw (indori) would cost.Lack of backpressure can lead to burnt valves and also loss of commpression was told by this by a very senior mech. Also hollow pipe sound like somebody beating a tin very loudly. I am not very technical and only used sbgw on my avl nothing on the ci. And on the avl the sbgw worked very fine without changing the bend pipe.
Cause I m From agra and we don't have a good market for aftermarket markets, all we get here are cheap parts sold at exuberant prices