Ninja BB
 

will just a ninja Back Box section improve flow at all?

not expecting it to change the bhp at all really, but wondering if it will and therefore effect my insurance?

bttt?

Nothing worth talking about, but it will affect your insurance in most cases anyway :)

thats basically what i thought. i presume it needs changes to the rest of exhaust, cats etc to start up-ing the bhp?

you may get a slight performance improvement changing the bb. i previously fitted a magnex oval to mine, the turbo seemed to ome in slightly later but it had a bit more pull at higher revs.