Yep, 1.6, 1.8, 2.0 and 2.2 exhaust systems are all the same. The only difference is that depending on age, some had a flange fit BB and some had a sleave fit to the BB. All of them except the turbo have a sleave fitting to the cat section. So from the cat back anything made for a Na Astra will fit, as long as its not off a coupe obviously.
