The SLP resonators is another term for the loudmouth 1s. The loudest they offer is the loudmouth 1, so if you want loud then buy those. Loudmouth 2s have more tone and sound like Borlas/Magnapacks, but I was always a fan of loudmouth 1s.
2014 Ford Focus ST (ST3, Tuxedo Black Metallic)
1997 Ford Mustang GT (Rio Red) (RMR #7832)
2003 Ford Mustang GT Centennial Edition (Black) (SOLD)
2004 Ford Mustang GT (Redfire) (SOLD)
1985 Chevrolet C10 Custom Deluxe (Red) (SOLD)