I have an exhaust leak at the header/cat-back connection. I have the Milltek cat-back and I have an OBX header with the OEM cat and piping bolted to it. The OEM exhaust piping (post cat) is a smaller diameter than the Miltek exhaust. The gasket that came with the MilkTek is a flat gasket that doesn't perfectly mate the two different size pipes together.

I have blown through 4 gaskets (leaked immediately) and 1 application of liquid gasket (last 2 weeks). I know I can't be the first person to use the OEM cat pipe with an aftermarkter exhaust. What type of gasket did you use?

 

Bump

I'd like to know as well if anyone has any input on what gaskets they use to mate up the stock header to the milltek especially since it is a bigger diameter.

 

We offer replacement Milltek gaskets at no charge (you just pay the shipping), so please let me know if I can help. greg@g-werke.com