I know civics whine in reverse, but i drove my friends 2012 Si, and mine whines a helluva lot louder than hers. At least 10 times louder! I love this car, but its the small stuff like the rev hang, clunky gearbox, and that freakin whine that are eating at my soul.
With my older Civic, i found Spoon Sports and T1R to be my top favorites for performance. I used some Injen parts in the past, but i ended up selling them within weeks of buying it.
What are your favorite aftermarket performance brands?