1 of 1 people found this helpful
What a difference over stock pipes
2004 Road King withstock header pipes and Sreaming Eagle mufflers... Previously (4,000 miles earlier) I installed S&S 510 Cam, updated oil pump and cam plate with a noticable difference in performance, due to the cam. Used Power Tune to map new settings. The engine ran a little rougher because of the almost double valve overlap over the stock cam, but a definite change in performance. The exhaust sound also changed quite a bit. A lot of "rappy" type sound at higher RPM but nice unbalanced sound at lower RPM.. I heard a small exhaust leak at the rear flange and discovered the header pipe was cracking. 72k miles on eng. After looking at all the options, S&S looked the best to me for design and cost. I have 38 years experience with G.M and have a deep technical knowledge of design and performance. The S&S design is exactly what this motor needed after getting the cam upgrade. The engine smoothed out, the exhaust doesn't sound challenged anymore as it did with the stock head pipes. The exhaust sounds and works so much smoother having a true, well placed and balanced cross-over connection. The left exhaust with the old header pipes always had lower volume due to a poor designed header. You could actually feel the difference L+R at idle and under load. Not any more. Now, both sides run evenly and smoothly. A true dual exhaust was definitely not an option, there's a large advantage with a well placed and balance cross-over, gaining mainly a little horsepower and a definite smoother exhaust performance.
I would recommend this product
by Stu on
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