so i got a custom bpipe put in, but when they cut the old bpipe out they didnt support the y pipe and the whole thing fell and got cought up and held by the o2 sensor. i am not saying its broken, but im not sure. i know the flex pipe is flexible, yet its fragile. what does the ypipe sound like if the flex section breaks. hissing? etc..

thanks

 

when mine broke it sounded like a regular exhaust leak.