1320 header v2 problem
 

I'm wondering if anyone is having this issue with v2 headers from 1320 performance. I installed it for the first time with berk HFC. I took the front pipe off and reinstall the stock front pipe same result. It makes the whistle sound like v1. Has anybody tried resolving this? I'm wondering if it could be the o2 spacer the cause. I never had this issue with OFH before it was sold a long time ago when I was living stateside.

Check the flex pipe, maybe have a crack on it

Figures kind of disappointed and under the impression it was resolved. Probably take it to a wielder shop in Germany and let them do the work to replace them. When I had someone rev it for me, it sounded from the tensioner which will make no sense since it has like 20k on it. My fuel trims would be - 2.34 which tells me it is or not the headers; running OFT Stage 2+ tune. My previous experience was the OFH and it was like + 9 and that was a loose o2 sensor and easy fix.

Are you using the O2 spacer with a tune?
The spacer is junk(I had multiple lean codes from it leaking) and it makes a horrible whistle sound.
Jut put the o2 sensor back in the stream if it’s tuned, the tune tells your ECU to ignore codes from it except for the lean code for leaks.
Otherwise I like my 1320 header/overpipe combo. It was a good deal, although it would be better without flexpipe