re-map

hows it going guys. a little advice guys planning on sorting my st tdci out this year.i've already purchased eibach lowering springs,wind deflectors and front splitter.what i would like help with is im going to have my st remapped and a dpf removed,but before do this should i have my exhaust...

Im thinking of using Angel tuning. They do a gold package which consists of re-map, filter and exhaust for £600. I dont know whether to trust them or not Help anyone?