Help diagnosing problem?

[vams]

Just had car tuned after installing otr, headers, high flow cats and full catback system. It's a 220k ve sv6 with an LLT (MY12).. one day after having tune driving home from work a metal on metal sound, couldn't hear it well due to listening to music and car now barely moves, like it's running on 15% of it's normal power .... originally thought cats were blocked or something but took them off and all good. There's what seems to be a loose timing chain sound when first starting up cold for about half a second before going away (sound in link below) and a further ticking when holding the car at 1.5-2k rpm. I feel like timing chains must have jumped but did think the timing issue was fixed on the LLT.... any thoughts or advice is greatly appreciated. Cheers

 

[hookalaya]

My VE v6 does the exact same **** only for a sec on cold start. Could be the oil pump pick up pipe o ring worn out that makes it lose pressure until u start it then within a sec or two noise has gone. Could also be your timing chains if its happening whilst your driving ide say its timing chains.

 

[hookalaya]

Its its hardly moving its probs the transmission

 

[lmoengnr]

Take it back to the tuner?

 

[krusing]

Get it scanned first, to see if there is any hidden DTC's.

 

[vams]

I did get it scanned again by tuner, no faults... it can't be transmission as sound is there while in neutral and holding 1.5k+ rpm

 

[woteva]

If there is no engine light, the cam chain has not stretched or jumped.

Drain oil and replace filter. Check for any metal particles in oil or filter with a magnet.