The Final Word
After everything was installed, the truck was strapped to a chassis dyno to see how much power the Yukon has now. As you can see by the numbers to the right, the installation of the JBA parts added 14.5 hp and 17 lb-ft to the peak numbers. Look at the numbers below 3,500 rpm; the JBA stuff really added some low-end grunt right in the sweet spot.

Read It And Weep!

RPM HP BEFORE HP AFTER TQ BEFORE TQ AFTER
2461 44.8 100.1 96 214
2552 56.2 117.0 116 241
2643 68.5 130.2 136 259
2734 79.2 139.6 152 268
2825 91.1 148.1 169 275
2916 104.2 154.8 188 279
3007 118.6 161.5 207 282
3099 132.8 167.4 225 284
3190 145.4 172.5 239 284
3281 156.5 178.3 251 285
3372 167.3 182.2 261 284
3463 175.6 186.1 266 282
3554 180.6 191.9 267 284
3645 186.7 198.5 269 286
3737 191.4 208.4 269 293
3828 196.2 219.1 269 301
3919 201.2 225.6 270 302
4010 209.6 232.9 275 305
4101 217.8 236.8 279 303
4192 229.1 241.6 287 303
4283 234.6 245.9 288 301
4374 238.5 250.1 286 300
4466 241.2 253.8 284 299
4557 246.9 256.3 285 295
4648 249.2 258.2 282 292
4739 248.6 261.3 276 290
4830 249.9 262.2 272 285
4921 251.6 265.3 269 283
5012 254.5 267.9 267 281
5104 249.2 268.2 256 276
5195 247.8 269.0 251 272
5286 243.9 267.2 242 266
5377 241.1 263.4 235 257
5468 239.5 263.1 230 253
5559 238.1 260.5 225 246
5650 237.2 256.1 220 238
5741 235.0 252.9 215 231
5833 233.7 254.1 210 229

SOURCE
JBA Performance Exhaust Co.
www.jbaheaders.com