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Header Dyno Testing & Comparison, Tri Y vs. 4 Into 1 - Performance By Design

Honda Header Showdown: Tri-Y Vs. 4-Into-1. Think You Know Which One Is Better? Back Up The Bench Racing With Data.

By Richard Holdener, Photography by Richard Holdener
Honda Header Comparison 4 To 1 Header Installed
As expected, the 4-into-1 header offered the highest peak power, measuring in at 204 hp. Interestingly enough, the 4-into-1 offered the highest peak torque reading as well, measuring in at 143 lb-ft. The high-rpm improvement was accompanied with a slight penalty in midrange performance.
Honda Header Comparison 4 To 1 Header Installed
As expected, the 4-into-1 header offered the highest peak power, measuring in at 204 hp. I
Dyno Data: Stock vs. Tri-Y
4-Into-1 (Horsepower)
RPM STOCK TRI-Y 4:1
4,000 84 84 85
4,500 101 101 101
5,000 115 116 114
5,500 137 138 134
6,000 150 151 150
6,500 165 167 167
7,000 181 184 185
7,200 191 193 196
7,500 194 199 202
7,700 195 201 204
8,000 191 196 198
8,500 186 192 193
CONNECT
Airmass (A Division Of Holley)
By Richard Holdener
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