new exhaust?
#1
new exhaust?
hi, everyone i've been thinking about doing some modifications to my monte's exhaust system. I dont want to do anything too serious that would cost alot of money since i am a student. I was wondering if maybe it was possible to remove some stock features that will increase the flow and improve the sound. would remoivng the cat and resonator be enough? would getting rid of these features mess with the cars computer system (o2 sensors)? would it sound good to straight pipe everything up to the mufflers but leave the mufflers? or maybe leave everything and remove the mufflers?
Im just wondering if doing any of this would make improvement and sound good or be a waste of time. Please give me some suggestions or anything that has worked for you with your monte carlo.
-thanks
Im just wondering if doing any of this would make improvement and sound good or be a waste of time. Please give me some suggestions or anything that has worked for you with your monte carlo.
-thanks
#5
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,175
I agree with BlueSS, ZZP 2.5" DP with high flow cat. I also vote resonator delete (that's how my Monte is).
Some say the exhaust is "droney" with out the res, I notice very little change (sounds a little tinny, but I'm OK with it).
Any cat change may result in an erroneous Check Engine code. I believe it's a P0420 code. Fixes for that are:
1 - use the spark plug non-fouler method to space the O2 out of the exhaust stream.
2 - have the code permanently deleted from the PCM with a tune.
Some say the exhaust is "droney" with out the res, I notice very little change (sounds a little tinny, but I'm OK with it).
Any cat change may result in an erroneous Check Engine code. I believe it's a P0420 code. Fixes for that are:
1 - use the spark plug non-fouler method to space the O2 out of the exhaust stream.
2 - have the code permanently deleted from the PCM with a tune.
#8
I was thinking of removing the cat along with the u-pipe and the resonator and in its place putting a straight pipe that leads to the rest of the exhaust. I would be leaving the existing mufflers but one big problem remains. By removing the cat, I would be removing the o2 sensor which would mean an engine code. What are some easy ways of getting rid of the code?
What is the spark plug non-fouler method? and how can I get the code simply removed?
What is the spark plug non-fouler method? and how can I get the code simply removed?
#10
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,175
One, I would NOT remove the cat unless you are in a location where you do NOT need to do any emissions tests.
You can still have an O2 bung put into straight pipe.
I would NOT leave the O2 sensor hanging or tied down, get it screwed into a bung. The spark plug non-fouler trick is a simple idea (it's what I was going to do if I needed to worry about an engine code before I had the I had the code permanently deleted from my PCM, but I never had to worry about it). Basically, in the Dorman help rack at the parts store is a thing called a spark plug non-fouler. You bore one out to fit the probe of the O2 sensor. You use it as a spacer (I've read it may take two total to may it work). It spaces the O2 out of the exhaust stream and it no longer has a problem and does not trip a code.
Look it up on the Internet. Many people with high flow cats on just about ANY make/model car have noted success with this method.
You can still have an O2 bung put into straight pipe.
I would NOT leave the O2 sensor hanging or tied down, get it screwed into a bung. The spark plug non-fouler trick is a simple idea (it's what I was going to do if I needed to worry about an engine code before I had the I had the code permanently deleted from my PCM, but I never had to worry about it). Basically, in the Dorman help rack at the parts store is a thing called a spark plug non-fouler. You bore one out to fit the probe of the O2 sensor. You use it as a spacer (I've read it may take two total to may it work). It spaces the O2 out of the exhaust stream and it no longer has a problem and does not trip a code.
Look it up on the Internet. Many people with high flow cats on just about ANY make/model car have noted success with this method.