Billygsi,ive got an astra sport phase 2 with a 2.0 xe redtop in mine
I cant confirm they are different or the same as the c18xe(your engine)
best thing to do is ask "Alex" the mk3 oc don,as he has been breaking a spec blue car with that very engine in,and he is pretty clued up with all manor of gsi,how much would you sell the induction pipe and trumpet for??
Sorry to learn you didnt sell your gsi billy,hope you get a result with it m8