Sounds like an exhaust leak to me.. Cause if it was internal your knock sensors would be cutting power and you would have a serious problem!

My thoughts too, but not sure how changing an axle would cause it, I guess it could be a coincidence

actually, I did throw a knock sensor code when I drove it today. i'll have to pull the code when I get home

It's P0326 Knock sensor 1 circuit performance

also throwing P0171 System too lean (bank 1)

As of now though the knock sensor CEL has turned off

They said exhaust leak? Lmao, um no, heck no it doesnt

why do you have false knock?
did you upgraded your motor and tranny mount?

Upgraded trans mounts give u false knock?

So it's not an exhaust leak lol. Ran my OEM LSJ manifold with no downpipe and noise is still there.

The only thing left is something on the bottom end or I was even thinking a really fubar'd TOB. I just can't understand why either of those would cause the car to run lean. At idle my LTFT are like ~27

I'm lost =/

yes it can

What's vacuum at,at idle?

19in. hg

is that coming from the blower? i recall some years back hearing a vid like yours and the guys blower was bad. in his case it was sold to him in that condition. i know i've been outta the game for a minute and i'm just trying to help.

no his is all motor noise. i would check out your bottom end and make sure nothing went bad down there

Seems a tad low. Mines at 20-21 ay idle. You may have a small leak causing the afr issue. As for the noise,id have to hear iit in person .

i wanna say its sc related ..not sure though. thats very odd noise lol

he took the belt off and started the car and it was there.. its got to be in the bottom end

Everything in the bottom end is new except crank main bearings.he's on stock clutch components with tons of miles.

Tob?

Possibly

i expect that. my stock clutch doesnt like the 2.8 at all. so i cant imagine his

Yea his clutch has been through tons of nitrous and now 2.7 pulley on e47

I haven't touched the car in 2 days but I'll check some other stuff today.

TOB was my second guess but other issues are throwing me off

So I threw the car on ramps and started it, then got underneath...its definitely coming from the engine FML

It sounds just like this to me

well i would say crank bearings since its the only thing you havent really replaced. but double check and make sure those rod bearings didnt go

Well ninja if it makes you feel any better I have a spare crank that's good and main bearings are only 30 bucks. The crank is 2.2 anything pre 07