I just bought a new at the dealership. It is ok to use OEM gasket on the lower flange.

 

I really want to know your Dyno numbers. I don't have a Dyno around here so post those numbers!!!!

 

my first run the tog was a gain of 13whp on a mustang dyno, the second run was a 9.9whp gain. i posted th elower numbers cause i was sure everyone would see atleast that, the 13whp would've been about 15whp gains on a dynojet.

 

Thanks for the update!

 

another thing you forgot to tell him is that the header doesn't fit flush against the motor period, a gap is clearly there when mounted.

 

I ordered a new one (only 3 in BC) but it did not come in so I just made one out of the same gasket material for the manifold side. I finally installed yesterday and what a pain getting 3 of the bolts tightened up. I did manage to do the install with out jacking up the car and I have no exhaust leaks. I took it for a run and I really enjoyed the extra kick it has.
I am getting it dynoed this afternoon and I will post the sheets when I get back from the shop.

 

there's no way you can see a gap on the manifold flange. it's impossible at the angle that is installed in.

my flange was perfect, it was about the only thing that was lol