Hi all,new to the forum. I recently purchased an RS4 saloon in mugello blue had a nightmare at first with it but ive got there in the end after lots of work

,anyway ive been looking into changing the standard exhausts for something abit more aggressive,after looking through here and various videos on
YouTube ive found something that I think suits what im after,it is milltek non-resonated centre sections (easy to find) and tubi rumore back boxes. After looking absolutely everywhere I can on the internet I cannot find the back boxes anywhere does anyone know of anywhere? or anyone that maybe selling some? or any maybe that are similar which are easier to find?
next question is a front splitter, again ive looked around the internet with not much luck. Theres a few on ebay but im not convinced by them most don't even show an example on the car,anyone tried any of them or know any that are nice?
Any help would be greatly appreciated
Thanks in advance
Craig