Exhaust installation Q

[MitchFong]

Question: when instaling a new exhaust, what do you do with the o2 sensor? I plan on having a y pipe to strait 2.25" piping to my magnaflow. But do i make the y pipe after the o2 sensor, or do i relocate the o2 sensor into the new piping? Would it make any sense to leave some stock piping and then join y pipe after o2 sensor?

[tonytony]

Question: Would it make any sense to leave some stock piping and then join y pipe after o2 sensor?

that would work, unless you plan on having headers added on too

[MitchFong]

nope. Just wondering if the stock piping after the manifolds with defeat the purpose of 2.25" piping?

[tonytony]

well from what i've read on here, single piping would have less surface friction, and saves weight. So it's a win win situation. I'm planning on going 2.5in single for my m50

[matt]

Less surface friction? Sounds like BS.

A single pipe saves weight, two pipes will get the exhaust out of your motor faster, unless they are too big (2x 2" is WAY too big)