Hello all, I'm a complete mechanical novice considering having a go at replacing the centre section of the exhaust on my 300 tdi 90. Watched a few videos online, but not entirely clear on whether or not I need any gaskets or sealant to do it it, along with the section itself? Considering ordering the relevant part from bearmach, is there an advantage in looking anywhere else, anything partially long lasting that wont break the bank? Many thanks in advance...