N1 backbox gasket size

[andyrob]

Can anyone confirm the size of the gasket between the backbox and b pipe on my ek9

 

[justingoldie]

its 2"

 

[egcmikey]

Have the spoon catback myself and b-pipe to cat is 2.5 donut gasket, and from b-pipe to backbox is oem fitment, which is bottlenecked down to a 2.25 donut gasket i believe. here is the part number 18229-S04-X12

 

[Barryl85]

Have the spoon catback myself and b-pipe to cat is 2.5 donut gasket, and from b-pipe to backbox is oem fitment, which is bottlenecked down to a 2.25 donut gasket i believe. here is the part number 18229-S04-X12

Surely its not a donut gaskets but the triangle 3 pin gaskets?

The only donut gasket should be between the manifold and cat.

 

[NeilVtec]

Thats from Cat - b-pipe that its a the 3 pin one!

As said from B-pipe to Backbox I allways used a 2.5 on mine, however my spoon is the GEN1 which doesn't bottleneck. 2.25 would also be fine!

 

[egcmikey]

oops excuse me for the error guys, the cat to b-pipe is the flat 3pin gasket indeed!

 

[egcmikey]

does that mean that the 1st gen will be louder than 2nd gen as theres no bottleneck??

 

[Barryl85]

does that mean that the 1st gen will be louder than 2nd gen as theres no bottleneck??

I'd definately say so, and also more free flowing for maximum gains. I'll never understand why they bottlenecked it a very good reason i'd never have a Spoon N1.