At Riffraff, we stock the PHP Hydra Chip because it fixes the two biggest problems with old-school 7.3 tuning: not knowing what tune you’re on and being stuck with whatever tune was installed ye … read more

A 7.3 Powerstroke thermostat housing leak often starts small—coolant smell, dried residue near the upper hose, or a slow drip that usually only shows up after a heat cycle. On 1999–2003 7. … read more

The 7.3L Powerstroke (1994–2003) earned its reputation the old-school way: simple, durable, and willing to work for a living. But even the legendary 7.3 has predictable wear points—especia … read more

The 6637 filter modification (often called the BHAF – Big Honkin’ Air Filter) is the classic 7.3 Power Stroke intake upgrade: replace the restrictive stock airbox with a large, heavy-duty … read more

Injectors are not all built the same, especially for the 7.3. Sizing varies year by year, and for a few, based on the location sold, too. Split shots, single shots, hybrids, AB, AD, 238/80, there's so … read more