MBRP makes great exhaust components, but the prices were just to high for some customers. While the headers still come in at just under 900.00 the cat back have come down alot. Now you can get an MBRP cat back for around 500.00. The mid pipes are reasonably prices (unless you want high flow cats, then they get pricey).
MBRP Mustang Exhaust & Long Tube Headers
Stage 3 Motorsports
Mustang Performance Parts Super Store