Hey guys new to this chat fest, my ba xr6t is coming to the end of its life after 300+ ks but couldn't let the old girl go, she has been to good to me. I played around with it and managed to get 295 rwkws which was pretty amazing, but I got myself a fg xr6t mk 11 with leather interior and took it to proformance shop in Sydney and he played around with it and put in a stainless steel exhaust??? and jumped on the dyno and now having a sweet ride with 328 rwkws…. can anyone tell me what effect the exhaust has on power output??