correct, back box only. glanza exhausts have different hangers, but someone handy with a welder could sort that. a back box on its own isn't really gonna help dude, perhaps a full s/s system from the likes of PowerFlow in Ballymena would be the way forward, or from Custom Pipes in Newtonabbey. for an all round solid upgrade that may give 2 or 3 bhp i'd recommend good sparks and leads (NGK and Magnecor), a K&N Panel filter (esp combined with your rolla manifold), a full s/s exhaust system and an earthing kit wouldnt go a miss either if you're lookin to keep things relatively cheap and simple and retain the stock 4efe. Phil.