Car has been making this strange noise for several months now without any other symptoms. I've taken to the dealership and a pro tuning shop and neither seemed concerned, but there's clearly something wrong with it. I'm freaking out and contemplating reverting to stock and trading it in to the dealership while they still want it, (and they do want it really bad).
I'm just completely confused because my logs are clean, it's boosting fine, has tons of power, it's not burning oil, I'm not hearing that classic loud rod/bearing knock, there are no heat-shields left to rattle, the mounts are fine, but it just doesn't sound healthy and I cringe every time I give it a high rev and check... and it's been doing this since the beginning of May at the latest!
Rotella T6 5W-40
First tuned in May of 2013.
Always warmed up before boost.
Not burning more than 1/2 qt / 3k miles.
No heatshields left, except for catback shield.
Datalogs are clean, with no FBKC or FLKC.
Hitting 19psi consistently and easily.
No apparent lose in power, pulls harder than ever, it seems.
Clutch will occasionally slip if you go WOT on a cold night, up a hill, etc. Otherwise, it holds fine.
Torqued Performance Stage III tune + Header
Perrin ELH & Uppipe
DSS Carbon Fiber Driveshaft
Denso Iridium One Step Colder Plugs
Process West TMIC
Invidia Catted DP
PTP Lava Turbo Blanket
DW65c Fuel Pump
Group N Engine Mounts
Kartboy Short Throw Shifter & Bushings
Kartboy Pitch Stop Motor Mount