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Discussion Starter · #1 · (Edited)
right after having a straight through exhaust custom made from cat back , i have been looking at removing the cat as well
but after a little search on here i cam across a thread were fahad mentioned not to remove the cat as this could cause issues with the turbo

how many 2.2 owners are running a decat on here, if there are have you had any issues

or can anyone else advise on this

phil
 

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Hello mate, as per reply to your PM, in my own opinion it's a bad idea as the turbo relies on backpressure to help it run efficiently. By derestricting, you are making it work harder.

Not on a Civic, but I've seen firsthand on a 58 reg 90k mile Seat Leon 2.0 TDI.. car was decatted, had been for a few weeks.. turbo started sounding a little weak.. car tuned, and within 20 yards on test drive - BOOM.

I'd only read about decatting being a bad idea on diesels before then.
 

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Discussion Starter · #9 ·
ok cheers guys , just remove the bottom one then
chip: dont surpose you could help me out if you still have your cat, i need a template of each flange so i can get the flanges made, so i can get mine decatted in one visit to the exhaust shop
thanks
phil
 

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old flange pillagers... am I the only one who thought that sounded quite funny? :D
 

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I wouldn't remove the first one, as F6HAD said, the turbo needs some resistance (in the form of backpressure)
This was why i was worried about the Martelius, but it made no boost difference :)

The second one is more of and 'extra' and shouldn't make any difference if removed, just a better flow of exhaust gasses
 

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Discussion Starter · #16 ·
Massive thanks for the flange diagram.
Did you find it on the net or source yourself.
Problem is I need the same for the flange on the other end of the cat as well
Thanks again
Phil
 

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Cockup Specialist
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Massive thanks for the flange diagram.
Did you find it on the net or source yourself.
Problem is I need the same for the flange on the other end of the cat as well
Thanks again
Phil
I measured it and cad'd it ;)

You'll have to wait fo rthe other one
:bootyshake: [smilie=cheeky-grin:... studying
 

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Discussion Starter · #18 ·
thats fine i dont mind waiting
i think the bottom flange on the cat has studs in??
if it does will it matter if i dont put studs in and just use nuts and bolts to attach it to the rest of the exhaust system

massive thanks again for you help
phil
 

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Both ends have studs ;)
Bolts replacement available on lings honda I believe.
Look like M10 thread..holes are 11mm on the flane I measured.
 

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Discussion Starter · #20 ·
ok thanks i have only seen the bottom flange ..lol
will see what i can soucre regarding the studs , but if there is a problem will standard nut and bolts do the job , as long as the bolts are tight in the holes???
 
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