Hi, I know a couple of you have mentioned doing this Soupie69 I remember commenting on this, but I changed my whole system and de-cat this weekend, but that's another thread. Bloody nightmare doing it with jacks & stands not a ramp, if I wasn't so eager I wouldn't have bothered and won't again! Anyway, me and a mate did it and tightened the nuts from turbo to cat pipe up as tight as poss at the time and used a new gasket but i'm sure it's leaking air from here. Does it normally need re-tightening after a bit? I did get a pattern gasket which looked a bit thin.. I can't get access to underneath so I guess i'll be taking the airbox out again tonight!