Quote:
Originally Posted by shern
the fluttering noise came back  it happens at around 3k-4k rpm ((( |
Being 100% honest, its probably the Tsudo header. It's a low-cost low quality knockoff brand header.
- I mean, brand new at ~ $350 shipped is very questionable.
- There is a reason why quality headers start at ~$600 bucks (Tomei, MXP, Borla) for this platform, while the premium ones (ACE, Nameless, JDL) are a little higher.
I'm willing to bet either the flanges are not straight at all, or the flex-joints/welds are like absolute crap.
If the noise went away for a bit with the replacement gasket + sealant - odds are it was the flanges.