I looked in the search section and couldn't find any answers. Maybe someone could help. Thinking about leaving the stock h pipe on instead of putting the o/r x back on due to the strict CA regulations. Anyone know how much my hp/tq will decrease by leaving the x off for the stock h? Current mods include ported TB, 2.76 upper w/100 lower, JLT RAI and Bassani catback. Numbers with o/r x: 472rwhp/502rwtq.
