ZCar Forum banner

Status
Not open for further replies.
1 - 7 of 7 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter #1
On a 1991 tt changing out the pre cats to stainless steel downpipes would that affect the emission readding out the exhaust? I know that the visiual inspection would fail, but what about the readings?

Thanks
 

·
Registered
Joined
·
152 Posts
well when i was considering this mod, i was told it wont affect them @ all once the car is @ normal operating temp, ill be pissed if i find out different now...
 

·
Registered
Joined
·
3,584 Posts
The pre-cats are only supposed to affect the emissions readings if they are doing a warm-up test. No place that I know of does that, certianly not here in Cali. The pre-cats are supposed to help the emissions until the main cats are heated up. After that, they have no affect on the emission readings.
 
1 - 7 of 7 Posts
Status
Not open for further replies.
Top