Got a magnaflow exhaust and it did nothin for sound. What else can I do to make it loud? I know about the o2 sensors but can I somehow bypass em without messing up the engine/computer?

 

You can bypass the sensors and it wont affect your engine but will turn on your check engine light. I assume you have a V10 or 5.4 because the diesels dont have o2 sensors.

With the V10 there isnt much you can do to improve the sound. Some have had success but most of the time they sound the same.

 

Got a '10 F250 XLT 6.4 v8 turbo diesel. I see 1 sensor before the particulate filter and 1 after the cat. Is there a way to do this without the check engine light to come on??

 

You can put some black tape over the check engine light. Otherwise, no.