damn I was hoping I could **** off my neigbors for a few days until my x pipe gets here

 

Well here's an idea of how an 03/04 cobra would sound with open headers. This dude's got cam's in there too, so yours probably won't sound exactly the same.

Sounds bad A$$

03 cobra open headers

 

i did this but only at idle, loud as F*** sounds like a stock car. dont think damage could happen with in one minute

 

I've seen that before...It does sound badass but i don't think i'd want my car that loud lol. I think stage 2 cams sound better than stage 3's or higher because you can still hear the tone of the exhaust.

 

i drove around without my o2 sensors hooked up for a week cuz i didnt have any extensions for my headers. youll be fine. dont listen to them. but dont drive long. itll **** your valves up

 

Yea his car is loud. I'm not sure what sort of exhaust he's running, but it really doesn't sound that much different than open headers.

 

My car wouldn't start without any o2 sensors in it, my car might be wierd...

 

You'll throw a few codes and it wil run lean at first but then very rich You'll be fine if it'll stay at idle and you avoid the cops. Just don't rev the sh.t out of it because you'll possibly burn a valve

 

Ok, aside from throwing some codes or maybe setting fire to the undercoating - The valve timing is often timed to move a long column of exaust gases like the one inside a full exaust system.

Removing all the back pressure can have the effect of actually having some of the intake charge be pulled straight out of the exaust. This is most noticed on cams with a lot of overlap.

It can burn the exaust valves but you really have no way of knowing without trying it.
The car may also loose power since the events in the intake and exaust cycle are off time due to the faster moving column of gasess.