So I've decided to straightpipe my 2007 Lexus is250 from the cats I was wondering if the light from the o2 sensor will come on and if it will is there any way to trick it if it does

 

It's possible, but all you'd need are O2 extenders. I personally used two 90 degree O2 extenders with my PPE headers.

 

I only deleted the rear cat and put a axle back on it.. sounds way beefier than expected.. you shouldnt need to straight pipe the whole thing to get a decent result! plus no lights and no codes from it. I got my cat deleted and straight piped for $60

 

thanks I'll probably do this