2015mustang

So I have Texas Speed Catted Long Tube Headers for my 2015 mustang gt. I have a corsa extreme catback exhaust and a K&N Drop in filter. The car is STOCK. i was wondering if a tune would be required after installation. i’ve read that you don’t need a tune because it comes with O2 Extensions...

For Sale, fits 2015-2020 Mustangs. 19x8.5/9.5. Weighs 19.5lbs. Tires have less than 10k, Michelin pilots sport as/3. I rather not ship them, and prefer local pick up. I'm around the Bay Area so message if interested. 1.3k obo.

I recently installed BBK shorty headers on my v6. I noticed after the install that there is a bit of a quick airflow hiss coming around the engine compartment when I just barely accelerate. What I'm hoping is that I just never noticed the sound before and it's just airflow going into the engine...