Deep exaust sound after oxygen sensor change on v6

[CCCP]

Well i finally changed my o2 sensor and first thing i noticed was power increase and this deep tone in the exaust, car sounds like a g35 now. Only happens while in gear, in 2,700 - 3,100rpm range, if reved in neutral it's all nice and quiet.
Is there is any explanation for this? I'm curious because i never heard a stock 1mz sound like this, on my friends 02 highlander it's completely quiet.
Maybe it's a design of aftermarket o2 sensor that makes it sound this way?

[CCCP]

anyone?

[amerikim]

Does not sound like the real deal bud.
If you are hearing more exhaust, check your fittings.
Also your flex pipe.
Hows the gas consumption?

[Ruffrydasean]

buh?

[Eye8Pussies]

maybe you poked a hole in your exhaust by accident while installing the o2 sensor?

[JetspeedCamry]

It shouldnt do that unless theres something wrong! haha.

I can understand if you had a free flowing exhaust system, because it may alter how and when the fueling is done. But on a standard system, you shouldnt notice any difference. Perhaps the sensor is not sealing? Causing a gap . i.e. exhaust leak.

[terrastrife]

or the a/f ratios are now more correct?

different a/f = different burn = different sound.

ie my car sounds like crap on ULP but sounds awesome on PULP.

[Mike Gerber]

I agree with Jetspeedcamry. Are you sure you screwed the O2 sensor all the way in to it's bung so it seals?

Mike

[CCCP]

yeah, it was all installed correctly. And it's not a sound of a leaking exaust, plus it's only sounds like this in gear.