markc0220k Posted January 27, 2020 Share Posted January 27, 2020 (edited) i just placed an order of Cobb dp last nite and asked them (Cobb) if it would come with gaskets for both ends. Cobb replied me no, but i could "re-use the factory turbo gasket and donut gasket. If those are getting old you can get replacements from Subaru directly." here is my question, since i'm going to remove the old dp, i really prefer to just put new gaskets for better sealing. But i could only find the dp inlet diameter is 3" and couldnt find the size of the other end. 2.5"? donut? i'm also thinking to buy Invidia Q300 in few days, and still searching for the size of its midpipe. is Subaru OEM gaskets fit? coz i think the aftermarket exhaust would be little bigger than stock. Beside, i saw some said the stock donut is "male" and won't fit? so, where can i buy gaskets and parts number please? thanks ps: i read so many reviews on both legacygt and nasioc, reviews if Q300 are quite mixed. some said its loud and some think its quiet. i know it's kinda individual preference. but i really want something little sleeper. any suggestion please? i think most of you agree with me and thus you chose legacy!! Edited January 27, 2020 by markc0220k Link to comment Share on other sites More sharing options...
RWebb Posted January 27, 2020 Share Posted January 27, 2020 It tapers down to a stock donut gasket on the lower end and the stock turbo gasket on the upper end. Link to comment Share on other sites More sharing options...
markc0220k Posted January 27, 2020 Author Share Posted January 27, 2020 It tapers down to a stock donut gasket on the lower end and the stock turbo gasket on the upper end. Q300 and stock are same diameter? then whats the point ppl get turbo-back upgraded? Link to comment Share on other sites More sharing options...
RWebb Posted January 27, 2020 Share Posted January 27, 2020 Q300 and stock are same diameter? then whats the point ppl get turbo-back upgraded? No idea on the Q300 but the Cobb tappers down from 3" to 2.5" so it can mate with stock. It removes some issues but you would need a custom flange put in for a true full 3" Link to comment Share on other sites More sharing options...
markc0220k Posted January 27, 2020 Author Share Posted January 27, 2020 ok, found the diameter of invidia q300 midpipe which is 2.992" (76mm). meaning i'm going to mate a dp 2.5 out to a 3" midpipe.. so any recommend gasket for mating cobb dp and this midpipe please? saw grimmspeed has one and was about to order .. but some said " never able to get the grimmspeed adapter to seal up correctly ":confused: Link to comment Share on other sites More sharing options...
markc0220k Posted January 28, 2020 Author Share Posted January 28, 2020 so can anyone let me know which gasket to mate a 2.5 dp to a a 3" midpipe (Invidia Q300) please? Link to comment Share on other sites More sharing options...
RWebb Posted January 28, 2020 Share Posted January 28, 2020 The stock donut gasket. You can see in the picture there is a flange on the end the donut gasket goes over. You will 99% change of needing a new one as its a PITA to get the old one off without destroying it. Link to comment Share on other sites More sharing options...
markc0220k Posted January 28, 2020 Author Share Posted January 28, 2020 The stock donut gasket. You can see in the picture there is a flange on the end the donut gasket goes over. You will 99% change of needing a new one as its a PITA to get the old one off without destroying it. oh got it .. much clear than what i've been confused from the forum now... thanks RWebb!! Link to comment Share on other sites More sharing options...
markc0220k Posted January 28, 2020 Author Share Posted January 28, 2020 (edited) so which gasket do i need .. ? GrimmSpeed Universal 3 inch ? or this one with a flaring? or this one that i saw it (sold seperately) with the invida q300 on the IIR ? Edited January 28, 2020 by markc0220k Link to comment Share on other sites More sharing options...
RWebb Posted January 28, 2020 Share Posted January 28, 2020 More like this one...this is the first one that cam up on search FYI not sure if its the right side. https://www.amazon.com/PitVisit-Downpipe-Gasket-Compatible-2005-2009/dp/B07W8Y983F/ref=sr_1_1_sspa?keywords=subaru+donut+gasket&qid=1580246708&s=automotive&sr=1-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE5OEZPSUZTMzZMSUYmZW5jcnlwdGVkSWQ9QTEwMDg4MTZFRVhTSkYwN0JMUlAmZW5jcnlwdGVkQWRJZD1BMDU5NzYzOTNWSFgxQkhCWjRXWTcmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl Link to comment Share on other sites More sharing options...
markc0220k Posted January 29, 2020 Author Share Posted January 29, 2020 got it..thanks RWebb, i also saw few youtubes and yes..they put this "donut" at the end of the dp before assemble the cbe too Link to comment Share on other sites More sharing options...
RWebb Posted January 29, 2020 Share Posted January 29, 2020 got it..thanks RWebb, i also saw few youtubes and yes..they put this "donut" at the end of the dp before assemble the cbe too Link? Link to comment Share on other sites More sharing options...
markc0220k Posted January 30, 2020 Author Share Posted January 30, 2020 Thanks Blake's Garage and hope he don't mind me to post his video here.. jump to 14:08 Link to comment Share on other sites More sharing options...
markc0220k Posted January 30, 2020 Author Share Posted January 30, 2020 the exact gasket tht i was confused before RWebb shown me the donut.. Link to comment Share on other sites More sharing options...
markc0220k Posted January 30, 2020 Author Share Posted January 30, 2020 (edited) oh wait, the dp outlet od is 2"3/8? but a donut i bought is 2.5" to 3" (since i just picked up a 3" cbe) , and their size available online is only either 2.25 to 3, or 2.5 to 3... now what:confused:?! Edited January 30, 2020 by markc0220k Link to comment Share on other sites More sharing options...
RWebb Posted January 30, 2020 Share Posted January 30, 2020 dry fit it. its the stock size. Link to comment Share on other sites More sharing options...
markc0220k Posted January 31, 2020 Author Share Posted January 31, 2020 ok..will begin to install these couple days...we'll see Link to comment Share on other sites More sharing options...
RWebb Posted January 31, 2020 Share Posted January 31, 2020 check the DP gasket before you tear everything apart. Does the '09 have a cat in the uppipe? Link to comment Share on other sites More sharing options...
markc0220k Posted February 1, 2020 Author Share Posted February 1, 2020 check the DP gasket before you tear everything apart. Does the '09 have a cat in the uppipe? no.. afaik Link to comment Share on other sites More sharing options...
RWebb Posted February 5, 2020 Share Posted February 5, 2020 How did it go? Link to comment Share on other sites More sharing options...
markc0220k Posted February 6, 2020 Author Share Posted February 6, 2020 the car is still in the air, hope i have time to fix it this wkd.. Link to comment Share on other sites More sharing options...
DaveWaters Posted February 8, 2020 Share Posted February 8, 2020 This is what I used along with the oem donut for the same setup as yours. Worked perfectly. https://www.grimmspeed.com/stock-dp-aftermarket-3-in-catback-adapter-subaru/ Link to comment Share on other sites More sharing options...
markc0220k Posted February 10, 2020 Author Share Posted February 10, 2020 This is what I used along with the oem donut for the same setup as yours. Worked perfectly. https://www.grimmspeed.com/stock-dp-aftermarket-3-in-catback-adapter-subaru/ oh, i bought the donut one. not install yet, but it looked exact the same as the stock Link to comment Share on other sites More sharing options...
markc0220k Posted February 10, 2020 Author Share Posted February 10, 2020 side by side, stock and cobb catted Link to comment Share on other sites More sharing options...
markc0220k Posted February 10, 2020 Author Share Posted February 10, 2020 (edited) side by side inlet of the dp ( see both gaskets are exact the same) i knw, i'd read lots of posts here and most ppl mention that no need a new turbo gasket, my bad.. im stubborn Edited February 10, 2020 by markc0220k Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now