I would get an air filter, i would drill the airbox :P

Inlet manifold - Mantzel (or Velos, OR Dbalis, or Lexmaul)
Exhaust manifold - Janspeed, Lexmaul, SBD

Must be the C16XE then. Wot air filter do u recommend?? Price not a problem.

Whats written on the top of your engine, does it say Ecotec or Vauxhall, is the upperinlet manifold black or metal
Vauxhall logo and black top inlet manifold= C16XE Ecotec and metal silver top inlet manifold= X16XE

Janspeed are good they are the same design as the lexmaul but mild steel, they wont last as long as a stainless as stainless have life time garentee but how long ya gonna have the car, while you have it it wont need replacing

Not sure if its X16XE or C16XE, how can u tell?? i need the downpipes as well, mine are rotten. Are the Janspeed 4-2-1 okay??

Do you just need the top part of the standard manifold or the down pipes too, i got a spare exhaust manifold for a GSI as in me picture, i have the down pipes too but they ae in real bad condition, is your car a X16XE GSI or C16XE
For performance manfolds you want a Janspeed £190 4-2-1 these are mild steel or a stainless one like Lexmaul which i have for £325ish got the janspeed from POTN and the Lexmaul from PVD

Exhaust manifold. I would prefer a 4-2-1 manifold for the right price, but a standard 1 will do for now.

oh and is it inlet or exhaust?

what kind of manifold, standard? or performance

I need a manifold for a 1994 GSi, any1 kno where i can get 1 pls????