Okay, so I'm in the market for an O2 housing... The question I have is this. Do you retain the stock donut gasket with an aftermarket O2 housing? I don't see how you can if the outlet is bigger??? I'm mainly interested in titek. I don't run a 3'' dp, I run the HKS which is like 2.65'' so I want to make sure this will work. Thanks.

 

You CAN reuse the stock donut gasket, but you should buy a new OEM one from Mitsu or somewhere like Lancershop. The fitment will be the same as the O2 outlet and the connection to the DP are always the same. I run a stock O2 on a 3" Megan DP and it fits perfect.

 

im going to pput in a MR turbo 02 housing with a helix DP should i go get a new donut gasket before i dig into my car?

 

there isnt a diff in the mr and the gsr o2 housings. buy an ebay special stainless housing. they also come with all the gaskets you need.

the part off the mr that i think you are refering to is the turbo exhaust hotside. the part the housing bolts to

 

Actually, I've seen a couple websites that list the MR O2 housing as an upgrade for the GSR's. I've always wondered if there was a difference.

 

by MR, I think they mean Megan Racing. . .

 

The Megan Racing o2 Hosuing has shown some of the highest gains for prolly the lowest price.

Why spend unnecessary money.

 

because with megan you are hit and miss with their 02 housing. why not just spend the extra 50 bucks to start and get a titek. way better quality

 

the megan racing is just as good i have not ha to replace any of the stock doughnut gaskets also use the stock o2 housing steel gasket we have MR o2 housings in stock

 

Thanks for all the responses, but the main question I have still stands... The stock O2 housing uses a doughnut gasket and the O2 housing outlet is 2.XX ". I have learned that aftermarket O2 housings retain the stock doughnut gasket. (Buy a new one, whatever.) My question is this... How is the aftermarket O2 housing with a larger diameter outlet, able to retain the same size doughnut gasket??? My first thoughts are, "It can't." Please tell me the real answer. I just got my Titek today. I do not have an extra doughnut gasket laying around to answer my own question. Thanks.