i was wondering if anyone with a removed exhaust has any dyno numbers? and if so is it removed from the axle or the s-pipe?what im trying to say is, will there be more gain with it removed from the s-pipe or axle.i already found that removed at the axle will give a gain of 5hp. link to source (https://www.scionlife.com/forums/viewtopic.php?t=80070)

if gains are good im planning on having an electrical cutoff valve

 

I've got to think you could make around 8-10 hp with exhaust unbolted after the s-pipe, however I'd be REALLY nervous about heat unless you had some kind of downturn pipe made. It would probably also very loud, i know the unbolted axleback is pretty loud.