I love F.I.'s exhaust, but the PPE headers are on a different level. The merge collector is a work of art. 15 degree angle, 5" smooth transition, they were tuned to a specific length to match the powerband of the motor, the black coating is just hawt. There is no bottom end loss, minimal gains, but the mid and top end lustworthy for an NA mod.
I refused to remove them when I wanted to go forced induction, so I spent more money to get something that fits around my PPE's