I'm looking to decat my stock c5 do I need to do anything else to prevent the engine light coming on?

 

The 02 sensors will need tuned out. Why do you want to?

 

Why bother?

 

Surely u must get more power and a deeper tone through the exhaust?

 

I don't think you will see any power difference, maybe a tone change. If you are going to go to the trouble of lifting the car I'd wait until you are ready to throw some long tubes on. Not sure where you live though so that might not be an option. Have you thought about other starter mods first? Check the c5 parts section, decent deals there.

 

How about a good tune (plugs/wires, fuel filter and take off, clean your T/B, new 02 sensors, a Vararam intake and a good tune by Chuck CoW.

You will feel the above, for starters.

 

You will see no significant gain in power. You may actually lose some torque in the process. As others have said, not worth the trouble. Look into getting a good aftermarket catback if you want a better sounding exhaust tone.

 

Nope

 

Giant waste of time and $$$.

 

That's a VERY BAD IDEA. It's not like we're in the 70's or 80's and the CARB'd or early injected

engines were clogging up the old pancake/pellet cats with soot making the car slow down significantly.

Today's cats are pretty amazing.... Especially the OE cats lasting in excess of 100K miles.

REMOVING or DE-CATTING is bad for several reasons....

1) NO POWER TO BE HAD and in fact if the car is more stock you might stand to lose some

bottom end torque.

2) Unpleasant / unhealthy rotten eggs odor warming the car up in the morning and sitting at the

traffic light idling..... Like I said, SMELLS BAD....and is less than healthy for you and the environment.

3) Louder / raspier exhaust tone and possible decel / pop / backfire.

4) compromise emissions compliance depending on the sate you live in.


Overall..... We get lots of people calling wanting to "make more power" or "save money" or both.

There is NO POWER TO BE MADE and saving a few dollars and inviting problems is NOT WORTH IT.

Trust me, it's not worth it for either reason and losing low end torque always makes it a bad decision.

Keep your CATS INTACT and breathe easy!
Chuck CoW

 

I bought my car with no cats. I'm fixing to put them back on.

 

My cats have been gone for 10+ years. I picked up a stock H-pipe and front pipes (w/o precats) from a shop that was going to toss them out. They were parts removed from a car installing headers and x-pipe. Look around you'll probably find some. Then I just welded straight pipe between. I have the complete original exhaust (~2kmi) tucked away in the garage.

O2 sensors, Originally I purchased some O2 simulators. They were expensive and would burn out about once per year. When the company decided to stop sending replacements I made my own. Pretty simple, just use a 555 timer and its never failed once.

Sound, with stock mufflers my first impression was that this is what the car should have sounded like from the factory. Not really louder, just a little deeper. I've since opened my mufflers, removed some of their internals and welded closed. Never had a deceleration pop / backfire.

Stink, never noticed it to be overly bad. Coming from the rotary world gives you an appreciation for potent exhaust. My uncorked Rx7 would literally drop you to your knees as if you were maced.

HP, I've been told 5-7. HP typically costs on the order of $50/HP, so I'll take the free $250.