Honda Accord V6 Header Dyno Results
The car used is a 2000 Accord V6 Coupe with 79,000 miles. It has the following modifications: AEM cold air intake, AEM power pulleys (alt. and p/s), Denso Iridium K20 spark plugs, Random Technology Catalytic converter, 2 3/8" dia custom cat-back exhaust system and Comptech Headers. The Dyno runs were done at Harv's Performance Center (12221 Rivera Rd, Whittier, CA.) on a Dynojet Model 248C Chassis Dynamometer. This data starts at 4300 RPM because Harve runs the car on the Dyno the same way it's driven on the street. Punch it in 1st gear, and let it go! The numbers here are the data obtained after the shift into 3rd gear, and up to the redline. The Car was run on July 25th with the Comptech headers then driven back to our shop to install the Prototype Racing headers. The very next day the car returned to Harv's for another run with the Prototype racing headers. The results are below. Thanks to Paolo Villarroel for the use of his immaculate Accord V6 Coupe!

Horsepower
RPM

4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200
6300
6400		 Comptech

120.3
123.0
128.3
135.3
137.8
138.9
143.2
147.6
150.6
154.0
158.4
162.1
165.6
171.3
173.3
172.8
176.7
177.8
177.6
177.4
186.7
182.0		 Prototype Racing
132.7
130.2
137.0
142.2
147.6
149.5
152.2
156.9
158.7
162.5
162.9
167.6
169.3
172.6
174.8
174.9
174.5
174.2
173.6
172.9
183.6
178.6		 Increase

+12.4
+7.2
+8.7
+6.9
+4.8
+10.6
+9.0
+9.3
+8.1
+8.5
+4.5
+5.5
+3.7
+1.3
+1.5
+2.1
-2.2
-3.6
-4.8
-4.5
-3.1
-3.4

Torque (lbs-ft)
RPM

4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200
6300
6400		 Comptech

146.9
146.8
149.7
154.5
153.9
152.0
153.5
155.1
155.1
155.6
157.0
157.7
158.2
160.7
159.7
156.5
157.3
155.7
152.9
150.3
155.6
149.4		 Prototype Racing
162.1
155.4
159.9
162.4
164.9
163.5
163.1
164.8
163.4
164.2
161.4
163.0
161.7
161.9
161.0
158.4
155.3
152.5
149.5
146.5
153.0
146.6		 Increase

+15.2
+8.6
+10.2
+7.9
+11.0
+11.5
+9.6
+9.7
+8.3
+8.6
+4.4
+5.3
+3.5
+1.2
+1.3
+1.9
-2.0
-3.2
-3.4
-3.8
-2.6
-2.8