I don't know what the issue is with running the exhaust straight back from the passenger side bank, maybe the frame gets in the way, or possibly the front driveshaft/t-case? But yes it seems that a lot of people cross it under the oil pan. A couple people put up some heat shields, others didn't seem to worry about it. Just make sure you can get to your drain plug and oil filter!
Rising Sun Bio
2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering,
no more Sanden OBA
1FZ-FE factory lockers +
Safari intercooled turbo, CDL switch, cup holder, Metric TLC leather, heated seats, JDM switches, PUMA OBA.
Warn M12000 waiting for a bumper.
Limited TRD 2UZ-FE SOLD