Anyone had experience of Sports Catalysts?

[shentodj]

Just bought Sports Catalyst for 98(R) Range Rover 4.6.

They (Rimmer Brothers) said they'd email me the spec etc, but have just phoned to say they won't be, as they don't have it. So, just wondered if anyone else had used one, or had used another make?

Thanks in advance for any tips/advice.

Dave S.