Janspeed manifold diameter
 

Anyone know what the diameters are on Janspeed manifolds (180)? Also do they have any markings on them?

I don't think anyone else has produced them so the ones you are looking at are either Janspeed, bespoke or O/E which will have the pre-cats.

Cheers. What does a precat look like?

Never mind, Google just answered he question :-)

I'm sure mine were 2.5", but I really can't remember