| Mod |
What did it do? How tested |
Cost ($/hp) | Who? |
Where to Buy? |
| Ravin Mufflers |
10 hp/15 ft-lb dyno |
$360 ($36) |
IceHeart400 | Midas |
| RSM 80 mm Throttlebody on 4L NS |
8 hp dynojet |
$250 ($31) |
Taylorsturf | RSM |
| Remove Cat |
6 hp g-tech |
$0 (free) |
Little Mike | N/A |
| RSM Intake on 4L NS |
8 hp/5 ft-lb dyno |
$199 ($25) | Taylorsturf | RSM |
| RSM Intake & TB 4L NS |
17 hp/17ft-lb dyno |
$450 ($26) | Taylorsturf | RSM |
| K&N Panel |
7 hp/4 ft-lb dyno |
$50 | Greg Garnes | |
| K&N Panel, Airbox Mods 4L NS |
8 hp/7 ft-lb dyno |
$50 | Greg Garnes |
Note: modification reports are unverified by CaddyInfo or Bruce Nunnally. Certainly doing multiple modifications often does not result in a summary of the improvements from each mod.