o2 sensor.

[ricco]

lol gen 4

[Dropz]

put a stock dump pipe on.

If it fixes your issue get a cat put in yours.

the issue only started when you modified your exhaust, so your exhaust is the issue.

the extra flow from the y-pipe and mufflers has changed the way the gases flow. now they flow at a higher velocity, so the o2 sensors readings have changed. along with that the second cat isn't as effective due to the heat difference between halfway down the car, and in the dump/engine bay. which gives inaccurate readings for the sensors.

[Boostaddict]

put a stock dump pipe on.

If it fixes your issue get a cat put in yours.

the issue only started when you modified your exhaust, so your exhaust is the issue.

the extra flow from the y-pipe and mufflers has changed the way the gases flow. now they flow at a higher velocity, so the o2 sensors readings have changed. along with that the second cat isn't as effective due to the heat difference between halfway down the car, and in the dump/engine bay. which gives inaccurate readings for the sensors.

Thanks man.

Yeh i have the cat in the the traditional spot not in the dump!!

I have discussed this before with a mate that has a spec b with the normal location cat with no issue.

[Dropz]

Try swapping with him for a week or two?

[Boostaddict]

Gunna try his af sensor first!!

Then maybe dump!!