Just picked one up used and it did NOT include gaskets.

What donut gasket do I need to purchase? Is there a specific size or application to get? Do I have to measure it and scour application guides looking for a size that fits?

This will be connecting to an OE GSR system (Temporarily).

Thanks!

 

You need the S2000 header gasket, it's 2.5".

Your going to need a cat w/ 2.5" inlet to bolt it up though.

 

i think you can get one from an Accord V6 or S2000.

and just like Chris93Si said.. your going to need a cat or *test pipe* with a 2.5" collector flange. Im using a straight test pipe i made myself. went and got 18" of 2.5" tubing from a muffler shop and had him flare one end to fit the donut gaskit. cost me $8.

then i got a 2 bolt flange and a 3 bolt flange for the exhaust side. Chop the piping down to size, slide the 2 bolt flange on, and then weld the 3 bolt flange onto the end. shouldnt cost more than $50 if u have the muffler shop make it for you. that including parts and welding. i got it welded by a friend for free.99

only trouble is finding a shop to do it.

You could contact SMS and get a nice 2.5" Carsound high flow made, but i think its upwards of $175.

 

s2000 gasket fits for sure. No idea on Accord V6.

Stock gsr cat flange that originally fit over the stock donut gasket might not make it - either need a bigger flange (and longer bolts) or a new cat.

 

ding ding.. 2.5" gasket from the s2000 is right
you could.. get a jdm ITR cat while your at and not have any problems.. or you could hack it up

 

S2000 or Legend donut

search under "legend donut" in the archive (post bodies) for more info