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Products » Tuning + Diagnostics » Engine Knock Detection and Knock Sensor Kits Find Knock Box - Single Channel Was: $825.00 Now: $725.00 Code: 340-000-000 Single Channel Knock Sensor Monitoring System. The Knock Box was developed during the racing development program for the Nissan R32 GTR with extensive testing in Australia and Internationally. It is a high quality and affordable tool for detecting engine knock in high performance, and race vehicles. View Details Knock Box - Dual Channel with Active Noise Reduction Headset Was: $1,775.00 Now: $1,575.00 Code: 340-000-011 Two Channel Knock Sensor Monitoring System with Active Noise Reduction Headset. The Knock Box was developed during the racing development program for the Nissan R32 GTR with extensive testing in Australia and Internationally. It is a high quality and affordable tool for detecting engine knock in high performance, and race vehicles. View Details Knock Box - Dual Channel Was: $1,375.00 Now: $1,175.00 Code: 340-000-001 Two Channel Knock Sensor Monitoring System. The Knock Box was developed during the racing development program for the Nissan R32 GTR with extensive testing in Australia and Internationally. It is a high quality and affordable tool for detecting engine knock in high performance, and race vehicles. View Details Knock Sensor for use with Knock Box Price: $32.00 Code: 310-070-304 Replacement or additional knock sensor for use with The Knock Box. View Details