bassani and slp offers full exhaust systems, for the hp go with slp because their headers are the longtube design. the bassani's Mid-length headers, will not make as much power as the longtubes.
5.0 Mustangs tested the SLP LTs and entire exhaust on an auto non PI Mustang. They claimed they gained 25 rear wheel hp. I just don't like the sound. I'm wondering what other exhaust options will bolt up to the SLP LTs. The LTs is where they gained all the power