Kudos to Hedman for making another option for mopar! The magazine dyno test was done on a pretty hot 440- 500hp plus. (mild by some peoples definition but even an old school HP 440, 509 cam, Torker intake, DP Holley ect did not make 500hp) On a milder 440 than the one tested the shorties will not have such a handicap to the long tubes. I say fit the shorties- ding where need then remove and have ceramic coated. I had a four into two GS1000 Suzuki exhaust system ceramic coated in satin black for $150. Place is only 25 miles from me to boot.