straight piped the explorer finally, sounds like a ricer. F250's in the re-do process, one side has full 2 inch straight pipe, the other side has half of a hollowed-out glasspack with 5 inch pipe. cant decide which i want. its not completely in time thats whats causing the loping. Explorer has the 4 liter OHV and the 250 has a 351 windsor with 427k on her