A BBK is really an exaggeration for the street for our cars IMO and I have one so I know. It gives you better pedal feel and it takes less pressure on the brake pedal to stop but for day to day it's an expensive investment for a smallish improvement. I bought the Stoptech BBK after overheating my brake pads on the track. For track use a BBK lets you get away with not having brake ducts. I can race and brake from over 100 to 35 for three 20 minute sessions without overheating the fluid or pads which I like .... and they look killer. The stock equipment is heavy but stops better than most cars on the street. So it's a personal decision.
I love the downpipes for the track too. For everyday driving ....... I'd rather have the low end torque of the stock exhaust. The smell without cats is unpleasant too. But with the cutouts open I got a 28 hp gain on the top end on the dyno. So it depends on how you use your car if you will hate them or love them. They absolutely make the car faster. With the cutouts closed I got an 18 hp gain.

Les