for off-road use only
| Part # | Description | Price | |
| 3103-RZ001 | Mazda RX7 TT, 93-96, with stock turbos | $286.00ea | |
| 3103-RZ003 | Mazda RX7 T, 87-91, with stock and sport turbo | $264.00ea | |
| 3306-SM002 | Mitsubishi Lancer Evolution 2003+, polished stainless steel | $391.60ea | |
| 33006-BF001 | Subaru Impreza WRX 01-03, downpipe for HKS exhaust, eliminates 2 rear cats, stainless steel/coated | $154.00ea | |
| 34998-BF001 | Subaru Impreza WRX 01-03, up-pipe, polished stainless steel | $158.40ea | |
| 3103-RT003 | Toyota Supra Turbo, 87-92, eliminates pre-cat | $228.00ea | |
| 3103-RT006 | Toyota Supra Twin Turbo, 93-98, O2 sensor mod required | $189.20ea |