Hi i have a Astra MK5 Sri sports hatch, im lookin at gettin a good straight threw exhaust system and a remap could anybody point me in the right direction as im not very good with cars

im lookin at spending bout £500 to £550.

If anyone is selling a exhaust system please let me no. Must sound good

what BHP increase will i be lookin at gettin? from these mods

Also would it be worth gettin a branch manifold with the exhaust system will this make any difference to the performance..

Thanks for your help