i'm using a 3" HFC mated to the oem downpipe and i'm wondering if i can use this flange to seal them off properly. the 3" gasket that came with the HFC has very little material and i'm afraid it's going to leak sooner or later, although it's working perfectly for now.

here:
http://www.maperformance.com/grimmsp...gs-077044.html

 

I'm having a similar issue. I have a huge leak where my TP connects to the OEM DP. I just ended up buying an MXP 3" DP lol...got tired of hearing it since I'm OCD.