Gasket size?

gtpeadar

Petrolheads
Howdy,
I need to put the original back box on my leggy for the NCT coz the nice sounding apexi one is pretty fooked. Anyhoo, i'm wondering what size the standard legacy centre section to back box is. I've seen 2.5" and 3" gaskets on ebay but not sure what one i need.

Oh yeah its a bh5 gtb

Also when i have the cash i'd like to replace the back box with a hayward and scott one. They come in either 3.5" or 4.5" exits with the 4.5" being described as "louder than the 3.5".
The apexi one i have has the nice boxer burble but not too loud even though its a 4.5" exit.
All opinions welcome

Thanx :thumbsup:

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