According to the last "paper" Parts Book (PR1104) the part numbers for the GTL (R 1128) exhaust are : Manifold pipe 77 00 578 443, S pipe 77 00 757 174, long pipe 77 00 757 178, silencer 77 00 859 523. These are for a GTL with chassis number higher than 477401. However, these numbers could have changed since the Parts Book was published in 1994, but if you ring a reputable dealer (I always use Lifestyle Renault in Tunbridge Wells) they should be able to track these numbers through to find the most recent one.