finally got money to spend on the car

**blownGP** · 11-02-2013

On I finally sold my truck and have extra money to spend on the car. But I've got a couple questions, first if I orders downpipe without the o2 sensor bung I know it'll throw a Code but will it affect anything else? And yes I know there are o2 emulators out there. And second I'd rather not spend the money on the $100 radio harness to retain the OnStar and steering wheel controls. Now I've heard some places the monsoon amp wi
Knt work without that harness and some places say it'll work with just the normal $10 harness. So I'd like to get a definitive answer. Thanks in advance! Oh and its a 2006 GT

**Fivefingerdeathpunch** · 11-02-2013

Likely with no cat and no rear o2 sensor on a 2006 car, you will see a check engine light and poor fuel mileage. The car will prolly run the cat test alot and dump fuel.

**00grandprixgtp** · 11-02-2013

why not buy a set of sd headers and top swap?

**matt5112** · 11-02-2013

Because a 2006 GT is already supercharged.

**00grandprixgtp** · 11-02-2013

Ahh lol ok then headers tune and 3.6 pulley

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**blownGP** · 11-02-2013

Originally Posted by Fivefingerdeathpunch

Likely with no cat and no rear o2 sensor on a 2006 car, you will see a check engine light and poor fuel mileage. The car will prolly run the cat test alot and dump fuel.

OK so the 10 dollar o2 sensor bung is probably worth it haha

Originally Posted by matt5112

Because a 2006 GT is already supercharged.

This haha

Originally Posted by 00grandprixgtp

Ahh lol ok then headers tune and 3.6 pulley

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Yah I was thinking a tune 2 but I read you have to get a 04 or 05 pcm