[68gt500]

I am still running without filters, because the stack screens really disrupt the original tune.

Cause is probably that the pressure difference between the filtered Air on the stacks and the jets under the screen.

K&N also makes a filter that encloses both the stacks and the jets - that should not change the tune - at least in theory.

The bad part is that these filters will interfere with the export brace on my Shelby - so I have not installed them - yet.