I would change the inlet manifold and not the exhaust manifold.
This because the cat is in the manifold it self. And there are only replacements for de Z18XE engine. I am using engine codes, because here in the Netherlands this engine is a GSi, and in the UK SRi.

The inletmanifolds from Dbilas are quite good.
Corsa C 1,2 16V 55kW Z12XEn HP gain: 17/23.

If you need to change your distributionbelt then I would suggest other sportier cams. From Dbilas offcourse
:rolleyes:

if a 1.2 has 75bhp to start with then it must be fairly hot as standard. So gains will be minimal.

see 75 BHP! http://www.corsasport.co.uk/board/viewthread.php?tid=42180

the 1.2 16V had a standard 75 dont it????? im on about the corsa c tho

u may only get a few bhp form an exhaust manifold but u may gain sum more torque too that is noticable :)

quote:

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Originally posted by Tom D
dint know u cud get inlets from lex for 1.2 16v?

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dint know u cud get inlets from lex for 1.2 16v?

u talkin bout exhaust manifold or inlet
exhaust manifold may give 5/6% power gain on sxi 65bhp will take it to 68.9bhp
5/6% on 1.4 16v is 95.4bhp

inlet manifold from lexmaul/velos etc
sxi 65bhp claims 20% powergain from these is roughly 78bhp
1.4 16 at 90bhp with inlet manifold will go to 20% powergain is 108bhp

however these may vary from car to car as no engine is same as no 2 machined parts are exact and condition of engine miles etc all play a important role.

correct me if im wrong boyz:wave:

Yep NOS al day long.....or a cheap Supra! lol

quote:

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Originally posted by chris_uk
what single mod would give me the most bhp increase

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This topic was posted a few days ago, have a look for a post named 1.2 16v !!! :thumbs:

what single mod would give me the most bhp increase

8bhp my ass. Maybe 2/3. Depending on how bad the original is.

i think manifolds are around £400, powergains around 8bhp.

Hi,

would changing the manifolds do owt to my car, Corsa C 1.2 sxi 16v.

how much would it cost & what sort of performance increase would i be looking at?

Cheers Fellas!