No lower than 4900 rpm. Any ideas Dwayne? I know you have an SF. I have the 871 absorber, it was far better but something is still off. I think it may be the inlet assembly valve not allowing suction. J.Rob

2009 PHR\EMC Competitor
2010 PHR\EMC Competitor
2011 PHR\EMC Competitor
2012 PHR\EMC Competitor
2013 PHR\EMC Competitor
2014 HotRod/EMC Competitor
2015 HotRod/EMC NoShow
2016 HotRod/EMC 3rd place SPEC Bigblock
2018 HotRod/EMC 7th place G3