Engine / Transmission Pre-Cat Removal

[Matt]

Matt submitted a new resource:

Pre-Cat Removal (version 1.0) - Pre-Cat Removal

Tools Required:
Socketset with sockets 8mm,10mm,13mm
Open ended spanners 13mm,10mm 23mm
Longs ocket extension
Chisel & Hammer
Electric Drill with drill bits
Copper Grease & WD40

Step1
Jack up the front of the car up and make sure it's secure!
Remove the ignition key and do not start the car till the mod had been finished.

Step2
From the back of the engine bay remove the heat shield from the exhaust manifold like in the picture below. (1st picture)

Step3
Now from under the car using a long...

Read more about this resource...

 

[mssri150]

What is the potential gain from doing this?

 

[corsaZ22se]

the engine breathes more freely.
the pre cat is known for blocking/collapsing as well.

 

[mssri150]

Yes makes sense do you not loose fuel economy though?

 

[corsaZ22se]

wouldn't know? mine has flowed head, bigger cams, full exhaust including manifold and a custom remap.
used to average 36mpg in the vectra b as a daily. upto 42mpgs on a long motorway run.
car was full of audio which made it heavy, around 1700kgs which eats up more fuel

 

[mssri150]

Ooh nice sat in a Corsa bet that goes like the clappers

 

[corsaZ22se]

the N/A one is ok.
the SC one is more fun

 

[ob one]

yeah that is fun