Hi guys i have a 99 wrx with a ej207 just wondering im running after market headers.3 inch dump pipe from turbo then into 2 and half inch sysytem with no cat. Could it drink more fuel with out the cat and running rich out the back of exhaust. anyone know where to start????

What ECU are you running? Who tuned it? Do you have an Oxygen sensor in your exhaust?

Could be pig rich or dead O2 sensor or oiled up MAF or your right foot..........

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

I assume im running std computer

You need to post more info for the internet tuners and mechanics to diagnose the issue for you

But generally, the mods you've suggested will result in more fuel being consumed
Mods are more effective if you were to tune to suit

I swapped out my o2 sensor with a genuine replacement. I gained an extra 80k's to a tank. It's a good start!

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MY06 STi

How many L/100 are you getting?

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Is that the correct way of measuring fuel efficiency?

Whoops I forgot to reply to this. I get an average of 500 to 550kms to a full tank of 98 petrol.

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MY06 STi

Sounds about right. I'm getting around 11L/100km running 10.8 AFR on WOT.

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Anywhere between 10-11 depending on how much of a pussy I'm being is about the norm.