Bottom line: for this power upgrade session, we spent $1,268 and gained nearly 13 hp and 6 lb-ft. Sounds like a little for so much, but this motor certainly displayed the difference on the road. Anything you can do to help the D Series breathe better will reveal itself fairly quickly under throttle.
Parts
GReddy stainless-steel 4:2:1 headers list for $439 and include oxygen sensor harness extension, bolts, gasket, warranty card and GReddy badge
Tools
Ratchet, 12mm socket, 6-inch extension, 12- and 14mm wrenches, WD-40
Installation Time
45 min
Temperature
Air temperature @ 78.5 degrees Fahrenheit
2000 to 3500 hp range: -3 to 2 / TQ range: 0 to 2
3500 to 5500 hp range: 0 to 4 / TQ range: 1 to 4
5500 to redline hp range: 3 to 6 / TQ range: 2 to 4
Peak hp 118.9 / TQ 99.9
| CONCLUSION |
| | HP Level | HP+ | TQ Level | TQ+ |
| BASELINE | 106.1 | | 94.0 |
| WEAPON-R SECRET |
| WEAPON INTAKE | 109.3 | 3.2 | 95.8 | 1.8 |
| GReddy |
| EVO2 EXHAUST | 112.9 | 3.6 | 97.5 | 1.7 |
| GREDDY |
| STAINLESS HEADER | 118.9 | 6.0 | 99.9 | 2.4 |
| |
| FINAL | 118.9 | 12.8 | 99.9 | 5.9 |