NGK 3951 Spark Plugs TR55 (6 Pack)

Customers find these spark plugs perform well, particularly for turbo Buicks, and appreciate their quality and value for money. They fit well and run smoothly, with one customer noting they're an exact replacement for their 2006 Silverado 4.3L. The durability receives mixed feedback - while some report they work for 6+ months, others mention cracked porcelain. The gap quality is also mixed, with some saying they come pre-gapped while others report issues.