Best Flow – Symmetric Mounting
Symmetric mounting allows an excellent flow of exhaust to the Pro-Gate.

Good Flow – Angled Mounting
Angled mounting allows a good flow of exhaust to the Pro-Gate.

Poor Flow – 90 Degree Mounting
90 degree mounting gives poor exhaust flow to the Pro-gate and in some
circumstances may contribute to over boosting.

Not recommended – Less than 90 Degree Mounting
An angled mounting as shown is not recommended and gives extremely
poor exhaust flow to the Pro-Gate.

So why do most people mount them at 90%??????