93 Octane

Felt a slight hiccup/misfire around 6500 RPM on the first two logs (19:57, 20:06). 3rd log felt clean (20:09).

2009 535i xDrive Wagon. N54 Engine, Vargas OEM+ Turbos with billet Compressors, VRSF Inlets & Catless Downpipes. Hard Pull all the way to redline shifting Manually.

Feels like clutch slip or boost leak is happening. 3rd gear or higher under WOT the revs will rise poorly and not steadily and fall back to normal when I let off.

CTS K04 / GIAC Tune

3rd gear, 2500 rpm start, 4th gear last 2 seconds, check engine light popped up

4th gear pull to redline and let off without engaging clutch

Normal driving and WOT pulls street. Methanol 270 cc nozzle. 1-17.5 psi.

Stock K03 turbo

4th gear pulls on highway 3k RPM and up, OAR earned a bit more with each pull