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  • Engine Airflow HP1537: A Practical Guide to Airflow Theory, Parts Testing, Flow Bench Testing and Analy zing Data to Increase Pe

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Buy from Amazon $20.24$2.99 $22.50 $17.50 $12.50 $7.50 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $19.98, Sep 11 7:36 am$16.98, Nov 17 - Nov 27$16.86, Nov 29 - Dec 7$17.10, Dec 10 - Dec 14$16.86, Dec 16 - Jan 12$18.12, Jan 12 - Jan 19$18.17, Jan 20 - Feb 2$17.93, Feb 3 - Feb 14$17.75, Feb 14 - Feb 28$17.57, Mar 1 - Mar 11$17.60, Mar 12 - Oct 6$17.60, Mar 12 - Oct 6$14.85, May 2 - May 16$13.96, May 2 - May 16$17.60, Mar 12 - Oct 6$14.83, May 17 11:19 pm$10.99, May 17 11:19 pm$17.60, Mar 12 - Oct 6$14.52, May 21 - May 22$13.29, May 19 - May 29$17.60, Mar 12 - Oct 6$14.85, May 22 - May 30$13.29, May 19 - May 29$17.60, Mar 12 - Oct 6$14.85, May 22 - May 30$12.45, May 30 1:44 pm$17.60, Mar 12 - Oct 6$13.28, May 31 - Jun 2$13.27, May 31 - Jun 4$17.60, Mar 12 - Oct 6$12.44, Jun 4 10:09 pm$12.08, Jun 4 10:09 pm$17.60, Mar 12 - Oct 6$13.28, Jun 6 - Jun 9$13.27, Jun 6 - Jun 9$17.60, Mar 12 - Oct 6$13.96, Jun 10 - Jun 18$13.95, Jun 10 - Jun 19$17.60, Mar 12 - Oct 6$13.95, Jun 10 - Jun 19$13.93, Jun 19 7:22 am$17.60, Mar 12 - Oct 6$14.09, Jun 20 - Jun 23$13.84, Jun 22 7:40 am$17.60, Mar 12 - Oct 6$14.12, Jun 23 - Jul 14$13.76, Jun 24 2:28 pm$17.60, Mar 12 - Oct 6$14.88, Jun 26 11:23 pm$14.12, Jun 23 - Jul 14$17.60, Mar 12 - Oct 6$14.12, Jun 23 - Jul 14$14.11, Jun 27 - Jul 13$17.60, Mar 12 - Oct 6$14.99, Jul 14 - Aug 7$14.88, Jul 16 4:57 am$17.60, Mar 12 - Oct 6$14.99, Jul 14 - Aug 7$14.12, Jul 17 - Aug 20$17.60, Mar 12 - Oct 6$14.88, Aug 8 - Aug 11$14.12, Jul 17 - Aug 20$17.60, Mar 12 - Oct 6$14.87, Aug 12 - Aug 19$14.12, Jul 17 - Aug 20$17.60, Mar 12 - Oct 6$14.80, Aug 20 - Aug 22$14.12, Jul 17 - Aug 20$17.60, Mar 12 - Oct 6$14.76, Aug 23 4:18 am$12.33, Aug 23 4:18 am$17.60, Mar 12 - Oct 6$14.49, Aug 25 - Aug 26$14.12, Aug 24 - Sep 23$17.60, Mar 12 - Oct 6$14.12, Aug 24 - Sep 23$13.60, Aug 27 - Aug 29$17.60, Mar 12 - Oct 6$14.50, Aug 30 - Sep 2$14.12, Aug 24 - Sep 23$17.60, Mar 12 - Oct 6$14.12, Aug 24 - Sep 23$13.60, Sep 3 - Sep 8$17.60, Mar 12 - Oct 6$14.79, Sep 9 - Sep 13$14.12, Aug 24 - Sep 23$17.60, Mar 12 - Oct 6$14.76, Sep 14 - Sep 26$14.12, Aug 24 - Sep 23$17.60, Mar 12 - Oct 6$14.76, Sep 14 - Sep 26$13.10, Sep 26 3:22 am$17.60, Mar 12 - Oct 6$14.65, Sep 29 9:23 am$12.07, Sep 29 9:23 am$17.60, Mar 12 - Oct 6$14.85, Sep 30 - Oct 3$13.28, Sep 30 - Oct 5$17.60, Mar 12 - Oct 6$14.61, Oct 4 - Oct 9$13.24, Oct 6 11:33 pm$16.68, Oct 9 - Oct 13$14.61, Oct 4 - Oct 9$13.00, Oct 9 1:40 am$16.68, Oct 9 - Oct 13$14.85, Oct 10 - Oct 13$12.29, Oct 11 6:31 am$16.68, Oct 9 - Oct 13$14.85, Oct 10 - Oct 13$11.84, Oct 13 11:10 am$17.60, Oct 14 - Nov 26$14.72, Oct 16 6:24 pm$11.45, Oct 16 6:24 pm$17.60, Oct 14 - Nov 26$14.64, Oct 19 12:30 am$11.17, Oct 19 12:30 am$17.60, Oct 14 - Nov 26$14.58, Oct 21 7:34 am$10.90, Oct 21 7:34 am$17.60, Oct 14 - Nov 26$10.61, Oct 23 6:17 pm$10.58, Oct 23 6:17 pm$17.60, Oct 14 - Nov 26$14.85, Oct 25 3:11 pm$14.34, Oct 25 3:11 pm$17.60, Oct 14 - Nov 26$14.36, Oct 28 - Nov 2$13.51, Oct 28 5:21 am$17.60, Oct 14 - Nov 26$14.85, Oct 31 1:15 am$14.36, Oct 28 - Nov 2$17.60, Oct 14 - Nov 26$14.92, Nov 2 - Nov 5$14.36, Oct 28 - Nov 2$17.60, Oct 14 - Nov 26$14.92, Nov 2 - Nov 5$14.27, Nov 5 1:13 pm$17.60, Oct 14 - Nov 26$14.90, Nov 11 - Nov 18$13.45, Nov 11 - Jan 6$17.60, Oct 14 - Nov 26$14.95, Nov 19 7:53 pm$13.45, Nov 11 - Jan 6$17.60, Oct 14 - Nov 26$14.92, Nov 20 - Dec 11$13.45, Nov 11 - Jan 6$17.77, Nov 27 - Nov 30$14.92, Nov 20 - Dec 11$13.45, Nov 11 - Jan 6$17.94, Dec 1 - Dec 4$14.92, Nov 20 - Dec 11$13.45, Nov 11 - Jan 6$17.76, Dec 5 - Dec 9$14.92, Nov 20 - Dec 11$13.45, Nov 11 - Jan 6$17.60, Dec 10 - Jan 10$14.92, Nov 20 - Dec 11$13.45, Nov 11 - Jan 6$17.60, Dec 10 - Jan 10$13.45, Nov 11 - Jan 6$13.40, Dec 12 - Dec 18$17.60, Dec 10 - Jan 10$14.05, Dec 21 11:55 am$13.45, Nov 11 - Jan 6$17.60, Dec 10 - Jan 10$14.92, Dec 29 - Jan 15$13.45, Nov 11 - Jan 6$17.60, Dec 10 - Jan 10$14.92, Dec 29 - Jan 15$13.44, Jan 7 - Jan 11$17.77, Jan 10 - Jan 14$14.92, Dec 29 - Jan 15$13.44, Jan 7 - Jan 11$17.77, Jan 10 - Jan 14$14.92, Dec 29 - Jan 15$13.02, Jan 12 - Jan 13$17.94, Jan 15 - Jan 23$14.93, Jan 16 - Jan 22$13.79, Jan 16 - Jan 23$17.94, Jan 15 - Jan 23$14.99, Jan 23 - Jan 27$13.79, Jan 16 - Jan 23$18.12, Jan 25 - Feb 1$14.99, Jan 23 - Jan 27$13.97, Jan 25 - Jan 27$18.12, Jan 25 - Feb 1$14.95, Jan 28 6:02 pm$14.93, Jan 28 - Jan 31$18.12, Jan 25 - Feb 1$14.93, Jan 28 - Jan 31$14.92, Jan 29 - Feb 6$18.12, Jan 25 - Feb 1$14.92, Jan 29 - Feb 6$14.92, Feb 1 - Feb 6$18.30, Feb 3 - Feb 6$14.92, Jan 29 - Feb 6$14.92, Feb 1 - Feb 6$18.48, Feb 6 - Feb 9$16.39, Feb 7 9:22 pm$15.00, Feb 7 9:22 pm$18.48, Feb 6 - Feb 9$13.70, Feb 9 - Feb 12$13.69, Feb 9 - Feb 12$18.66, Feb 11 - Feb 22$13.70, Feb 9 - Feb 12$13.69, Feb 9 - Feb 12$18.66, Feb 11 - Feb 22$12.03, Feb 14 - Feb 16$12.02, Feb 14 - Feb 16$18.66, Feb 11 - Feb 22$13.23, Feb 17 2:50 am$13.22, Feb 17 2:50 am$18.66, Feb 11 - Feb 22$14.71, Feb 19 - Feb 20$12.41, Feb 19 1:36 am$18.66, Feb 11 - Feb 22$12.03, Feb 22 - Feb 24$12.02, Feb 22 - Feb 24$18.84, Feb 24 - Feb 28$12.03, Feb 27 6:11 pm$12.02, Feb 27 6:11 pm$19.02, Mar 1 - Mar 13$12.41, Mar 1 6:15 pm$12.41, Mar 1 6:15 pm$19.02, Mar 1 - Mar 13$5.97, Mar 4 6:03 am$2.99, Mar 4 6:03 am$19.02, Mar 1 - Mar 13$12.41, Mar 7 - Mar 8$12.40, Mar 7 - Mar 8$19.02, Mar 1 - Mar 13$12.03, Mar 9 7:01 am$12.02, Mar 9 7:01 am$19.02, Mar 1 - Mar 13$12.81, Mar 11 2:12 pm$11.47, Mar 11 2:12 pm$19.02, Mar 1 - Mar 13$13.54, Mar 13 11:01 pm$10.91, Mar 13 11:01 pm$19.17, Mar 15 - Mar 26$13.31, Mar 16 5:19 pm$10.30, Mar 16 5:19 pm$19.17, Mar 15 - Mar 26$13.51, Mar 18 8:15 pm$9.84, Mar 18 8:15 pm$19.17, Mar 15 - Mar 26$13.52, Mar 21 4:22 am$9.34, Mar 21 4:22 am$19.17, Mar 15 - Mar 26$13.52, Mar 24 4:35 pm$8.56, Mar 24 4:35 pm$19.17, Mar 15 - Mar 26$13.31, Mar 26 11:54 pm$9.02, Mar 26 - Mar 29$18.97, Mar 28 - Mar 30$12.13, Mar 29 8:15 am$9.02, Mar 26 - Mar 29$18.97, Mar 28 - Mar 30$14.70, Mar 30 1:09 pm$13.08, Mar 30 1:09 pm$18.78, Apr 2 - Apr 4$13.73, Apr 3 - Apr 6$12.79, Apr 3 - Apr 6$18.75, Apr 6 - Apr 25$13.51, Apr 7 11:38 am$12.76, Apr 7 - Apr 13$18.75, Apr 6 - Apr 25$13.73, Apr 13 5:35 am$12.76, Apr 7 - Apr 13$18.75, Apr 6 - Apr 25$14.65, Apr 17 10:07 am$13.52, Apr 17 10:07 am$18.75, Apr 6 - Apr 25$14.57, Apr 20 2:12 am$13.32, Apr 20 2:12 am$18.75, Apr 6 - Apr 25$13.97, Apr 22 8:03 pm$13.72, Apr 22 - Apr 24$18.75, Apr 6 - Apr 25$13.93, Apr 24 - Apr 25$13.35, Apr 25 5:16 pm$18.75, Apr 28 - May 9$13.93, Apr 28 - May 4$11.54, Apr 28 5:44 pm$18.75, Apr 28 - May 9$13.93, Apr 28 - May 4$12.44, May 1 - May 2$18.75, Apr 28 - May 9$11.67, May 5 3:39 pm$11.66, May 5 3:39 pm$18.75, Apr 28 - May 9$11.31, May 7 3:59 am$11.30, May 7 3:59 am$18.75, Apr 28 - May 9$12.44, May 9 3:59 am$12.43, May 9 3:59 am$18.81, May 11 - May 14$12.05, May 11 3:49 am$12.04, May 11 3:49 am$18.81, May 11 - May 14$12.44, May 14 10:29 am$11.30, May 14 - May 18$18.87, May 18 11:39 am$11.30, May 14 - May 18$11.27, May 18 11:39 am$18.93, May 22 - May 29$10.00, May 22 5:02 pm$9.99, May 22 5:02 pm$18.93, May 22 - May 29$10.18, May 26 11:17 pm$9.65, May 26 11:17 pm$18.93, May 22 - May 29$10.24, May 29 5:44 am$9.54, May 29 5:44 am$18.99, Jun 2 - Jun 5$11.96, Jun 2 9:07 pm$7.94, Jun 2 9:07 pm$18.99, Jun 2 - Jun 5$10.81, Jun 5 5:40 am$6.76, Jun 5 5:40 am$18.80, Jun 7 - Jun 17$9.50, Jun 7 2:15 pm$5.50, Jun 7 2:15 pm$18.80, Jun 7 - Jun 17$9.18, Jun 11 1:31 pm$4.99, Jun 11 1:31 pm$18.80, Jun 7 - Jun 17$13.27, Jun 13 1:32 pm$9.40, Jun 13 1:32 pm$18.80, Jun 7 - Jun 17$10.58, Jun 15 11:48 am$10.57, Jun 15 11:48 am$18.80, Jun 7 - Jun 17$10.07, Jun 17 9:04 am$10.06, Jun 17 9:04 am$18.61, Jun 21 - Jun 29$13.93, Jun 21 - Jun 29$10.13, Jun 21 4:26 am$18.61, Jun 21 - Jun 29$13.93, Jun 21 - Jun 29$10.53, Jun 23 2:31 am$18.61, Jun 21 - Jun 29$13.93, Jun 21 - Jun 29$10.98, Jun 25 - Jul 3$17.01, Jul 1 - Jul 3$11.97, Jul 1 3:15 am$10.98, Jun 25 - Jul 3$17.01, Jul 1 - Jul 3$13.93, Jul 3 6:55 am$10.98, Jun 25 - Jul 3$15.72, Jul 7 - Jul 10$12.58, Jul 7 12:33 pm$11.71, Jul 7 12:33 pm$15.72, Jul 7 - Jul 10$12.55, Jul 10 9:18 am$11.44, Jul 10 9:18 am$16.01, Jul 13 - Jul 22$13.47, Jul 13 - Jul 15$12.00, Jul 13 2:34 am$16.01, Jul 13 - Jul 22$13.47, Jul 13 - Jul 15$13.01, Jul 15 1:01 am$16.01, Jul 13 - Jul 22$12.24, Jul 16 10:06 pm$12.24, Jul 16 10:06 pm$16.01, Jul 13 - Jul 22$12.93, Jul 20 2:11 pm$12.25, Jul 20 - Aug 17$15.89, Jul 24 - Jul 26$12.25, Jul 20 - Aug 17$11.89, Jul 24 6:07 am$15.89, Jul 24 - Jul 26$13.20, Jul 26 3:31 am$12.25, Jul 20 - Aug 17$15.27, Jul 29 - Aug 2$12.25, Jul 20 - Aug 17$12.23, Jul 31 1:33 pm$15.27, Jul 29 - Aug 2$12.25, Jul 20 - Aug 17$11.39, Aug 2 9:35 am$14.84, Aug 4 - Aug 10$13.92, Aug 4 5:41 am$12.25, Jul 20 - Aug 17$14.84, Aug 4 - Aug 10$12.25, Jul 20 - Aug 17$10.07, Aug 6 - Aug 10OOS $14.84, Aug 12 5:34 am$12.25, Jul 20 - Aug 17$11.50, Aug 12 5:34 amOOS $15.67, Aug 15 - Aug 17$13.93, Aug 17 - Sep 9$12.25, Jul 20 - Aug 17$16.99, Aug 19 - Aug 21$13.93, Aug 17 - Sep 9$11.87, Aug 19 6:50 pm$16.99, Aug 19 - Aug 21$13.93, Aug 17 - Sep 9$12.14, Aug 21 5:15 pm$17.33, Aug 23 - Sep 5$13.93, Aug 17 - Sep 9$12.24, Aug 23 2:43 pm$17.33, Aug 23 - Sep 5$13.93, Aug 17 - Sep 9$11.99, Aug 27 - Aug 29$17.33, Aug 23 - Sep 5$13.93, Aug 17 - Sep 9$11.94, Sep 1 10:10 pm$17.33, Aug 23 - Sep 5$13.93, Aug 17 - Sep 9$12.46, Sep 5 7:36 pm$19.82, Sep 9 - Sep 21$12.41, Sep 11 5:10 pm$11.35, Sep 11 - Sep 13$19.82, Sep 9 - Sep 21$11.35, Sep 11 - Sep 13$10.92, Sep 13 4:27 pm$19.82, Sep 9 - Sep 21$9.97, Sep 17 1:25 pm$8.00, Sep 17 - Sep 21$19.82, Sep 9 - Sep 21$12.42, Sep 21 10:46 am$8.00, Sep 17 - Sep 21$19.87, Sep 23 - Sep 25$12.43, Sep 23 11:03 am$7.79, Sep 23 - Oct 3$19.87, Sep 23 - Sep 25$12.26, Sep 25 11:08 am$7.79, Sep 23 - Oct 3$19.92, Sep 27 - Sep 29$12.07, Sep 27 10:47 am$7.79, Sep 23 - Oct 3$19.92, Sep 27 - Sep 29$11.90, Sep 29 10:37 am$7.79, Sep 23 - Oct 3$19.67, Oct 3 12:11 pm$11.54, Oct 3 12:11 pm$7.79, Sep 23 - Oct 3$19.47, Oct 7 2:48 pm$11.47, Oct 7 2:48 pm$7.61, Oct 7 2:48 pm$19.27, Oct 11 - Oct 27$8.51, Oct 11 5:21 pm$6.49, Oct 11 - Oct 21$19.27, Oct 11 - Oct 27$6.89, Oct 15 3:53 pm$6.49, Oct 11 - Oct 21$19.27, Oct 11 - Oct 27$6.49, Oct 11 - Oct 21$5.95, Oct 17 3:10 pm$19.27, Oct 11 - Oct 27$6.49, Oct 11 - Oct 21$5.13, Oct 19 2:16 pm$19.27, Oct 11 - Oct 27$13.93, Oct 23 - Nov 2$12.45, Oct 23 1:29 pm$19.27, Oct 11 - Oct 27$13.93, Oct 23 - Nov 2$12.17, Oct 25 12:18 pm$19.27, Oct 11 - Oct 27$13.93, Oct 23 - Nov 2$12.25, Oct 27 12:05 pm$19.07, Oct 29 - Oct 31$13.93, Oct 23 - Nov 2$12.05, Oct 29 12:19 pm$18.88, Nov 2 - Nov 4$13.93, Oct 23 - Nov 2$12.11, Nov 2 1:11 pm$18.88, Nov 2 - Nov 4$13.63, Nov 4 2:27 pm$11.92, Nov 4 2:27 pm$18.94, Nov 6 - Nov 15$12.25, Nov 6 - Nov 17$8.75, Nov 6 4:57 pm$18.94, Nov 6 - Nov 15$13.63, Nov 8 - Nov 13$12.25, Nov 6 - Nov 17$18.94, Nov 6 - Nov 15$12.25, Nov 6 - Nov 17$12.00, Nov 15 - Nov 17$19.00, Nov 17 - Nov 21$12.25, Nov 6 - Nov 17$12.00, Nov 15 - Nov 17$19.00, Nov 17 - Nov 21$13.63, Nov 21 - Nov 26$13.36, Nov 21 3:53 pm$19.06, Nov 23 - Nov 26$13.63, Nov 21 - Nov 26$13.17, Nov 23 9:36 pm$19.06, Nov 23 - Nov 26$13.72, Nov 26 3:43 am$13.63, Nov 21 - Nov 26$19.12, Nov 28 - Dec 10$13.29, Nov 28 - Jan 9$12.00, Nov 28 12:00 pm$19.12, Nov 28 - Dec 10$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$19.18, Dec 16 12:07 am$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$19.12, Dec 20 - Dec 31$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$19.14, Jan 2 2:26 pm$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$18.93, Jan 5 - Jan 7$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$18.74, Jan 9 - Jan 17$13.63, Dec 3 - Mar 7$13.29, Nov 28 - Jan 9$18.74, Jan 9 - Jan 17$13.64, Jan 12 11:32 am$13.63, Dec 3 - Mar 7$18.74, Jan 9 - Jan 17$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.55, Jan 19 - Jan 25$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.36, Jan 27 - Feb 1$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$20.24, Feb 4 7:50 am$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.17, Feb 6 9:47 pm$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.42, Feb 9 - Feb 12$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.23, Feb 14 - Feb 20$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$18.04, Feb 22 - Feb 25$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$17.86, Mar 7 2:56 am$13.63, Dec 3 - Mar 7$13.29, Jan 17 - Mar 7$17.93, Mar 18 11:48 am$13.94, Mar 18 - Apr 10$13.77, Mar 18 11:48 am$17.75, Mar 24 12:37 pm$13.94, Mar 18 - Apr 10$13.24, Mar 24 12:37 pm$17.57, Mar 30 - Apr 5$13.94, Mar 18 - Apr 10$13.41, Mar 30 8:50 am$17.57, Mar 30 - Apr 5$13.94, Mar 18 - Apr 10$12.85, Apr 5 4:53 am$17.39, Apr 10 11:38 pm$13.94, Mar 18 - Apr 10$13.11, Apr 10 11:38 pm 35,519528,164 410,156 273,438 136,719 0 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr Jun 2015 2016

Price Details

New

Last Seen $17.39 Apr 10, '16
Highest $20.24 Feb 4, '16
Lowest $14.84 Aug 12, '15
Average $17.71 (30d avg)
$18.17 (90d avg)
$18.63 (180d avg)
$18.29 (365d avg)
$18.11 (Lifetime average)
Added Sep 11, 2013

3rd Party New

Last Seen $13.11 Apr 10, '16
Highest $16.39 Feb 7, '15
Lowest $2.99 Mar 4, '15
Average $13.32 (30d avg)
$13.32 (90d avg)
$12.80 (180d avg)
$12.10 (365d avg)
$12.81 (Lifetime average)
Added Sep 11, 2013

3rd Party Used

Last Seen $13.94 Apr 10, '16
Highest $15.00 Feb 7, '15
Lowest $5.97 Mar 4, '15
Average $13.94 (30d avg)
$13.71 (90d avg)
$13.15 (180d avg)
$12.42 (365d avg)
$13.22 (Lifetime average)
Added Sep 11, 2013

Sales Rank

30 day average: 200,270
90 day average: 217,022

Product Description

This informative, fully illustrated handbook includes basic discussion on the science of engine airflow and relationships, how flowbenches work, testing individual engine components, how to analyze the data, calibration issues, intake and exhaust tuning, engine formulas, and putting it all together for maximum performance.

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