Odd "Exhaust Leak" Plus Knock

[sleepydsm]

About 2 weeks after putting on a new mitsu MLS gasket, and a freshly machined and rebuilt head, I did a WOT pull, 5th gear, 30PSI (Big load).

Around 5k RPM, I get a noise that sounds like an exhaust leak, and my CEL comes on (set for knock on Link) (There are not stored DTCS, so it isn't a real CEL). MY paranoia says omfg, maybe it's my really old used regular ARPS stretching/ head lifting... BUT I have no over heating issues, or KNOWN coolant loss.

Let's pretend my turbo collector gasket was blown out. And with enough backpressure makes this noise. Is that exahust leak upstream of the 02 sensor gonna eff with anything? That probably doesnt matter though as the car at WOT ignores the o2 sensor and goes off what the tune for LINK is, right?

I haven't done much digging. This noise only happens with a load, revving the engine cannot recreate this.

Any ideas? Other than that, the car drives normal w/o any issues. I have someone that will buy the car as soon as I get this fixed!


Thanks! See ya at the cookout!!