ok please help. im installing my helix dp to my megan 02 housing. what gasket do i use? the stock donut style wont fit in the dp. the helix is a 3"dp. either pipe came with a gasket to fit between the 2. im in need of some help. asap

 

A new donut gasket should have come with the DP. It will not fit completely in to the DP and isn't supposed to. It should fit snugly on the O2 though.

 

it did not thanks to the great customer service of Gruppe-s...terrible. but i think i understand due to the spring washers on the dp to housing? i can reuse the old one right? it is in good shape and fits on the new dp fine.

 

but the gasket does not fit in there barely at all compared to the stock dp and 02 housing?

 

come on guys im in the middle of the install