Downpipes for an Akrapovic Evolution Titanium Exhaust System

[Paulm]

The bigger the downpipe the more noise and potentially more power you will get.

Assuming you are going for a non MOT legal option of cat bypass rather than the legal sports cats then there are plenty of options. I don't know if they are all a straight fit onto the Akra though.
Options include milltek, brondex, APR and Akra will sell you one made by the same company that makes their exhausts (or is made by akra but branded by this other company can't remember which way round it is).

just in case UK drives are reading this Brondex will only fit left hand drive cars. i proved that. Absolutly no support from the company re not fitting RHD cars. They had my money and that was that.

Centre cats with a dual system I would be surprised if you lose anything over 5-10bhp. Moving the cats to the mid section wont be cheap though. Cats in the downpipes, best place for efficiency but worst for power

[MikeFish]

I know at least 2 people with right hand drive cars with brondex pipes

[Paulm]

yes but not without mods They hit the steering column. it even says on their website now, LHD only