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The popular 6637 filter, a modification for 7.3L Power Stroke owners, lost 12HP on the dyno compared to a standard S&B intake.
The open-element filter caused exhaust gas temperatures to spike by 200 degrees.
The 2025 Ultimate Callout Challenge once again solidified its reputation as the premier event in diesel motorsports. More than 30,000 fans attended the three day event in Indianapolis.
The 2025 National Hot Rod Diesel Association (NHRDA) season kicked off in high-octane style at Firebird Motorsports Park in Chandler, Arizona. Sponsored by Hot Shot’s Secret.
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