pop the cat or no?
#1
#3
#11
Originally Posted by greygooseranger
I noticed no power loss or gain from it
#13
Originally Posted by 01xltranger4x4
More back pressure = Usually better low end (stock exhaust/cats)
Less back pressure = Usually better top end, less low end (aftermarket exhaust/cats)
Less back pressure = Usually better top end, less low end (aftermarket exhaust/cats)
#15
#18
I have no cats on my impala and a Hooke cat back system with Clear image Tri-y headers and I have dyno results to prove that opening up the exhaust hepled out my low end torque. Granted new vehicle cats are glorified resonators (with the advent of sequential Fuel injection cars can very easily be low emissions without cats) it really won't make much of a difference whether you have them or not. My Car is 12 years old and had very restrictive cats, that were like pushing exhaust through a shop rag.
BTW no emisions here or wehre I am going!
~HJ
BTW no emisions here or wehre I am going!
~HJ
#19
Originally Posted by HAZZARDJOHN
I have no cats on my impala and a Hooke cat back system with Clear image Tri-y headers and I have dyno results to prove that opening up the exhaust hepled out my low end torque. Granted new vehicle cats are glorified resonators (with the advent of sequential Fuel injection cars can very easily be low emissions without cats) it really won't make much of a difference whether you have them or not. My Car is 12 years old and had very restrictive cats, that were like pushing exhaust through a shop rag.
BTW no emisions here or wehre I am going!
~HJ
BTW no emisions here or wehre I am going!
~HJ
Originally Posted by HAZZARDJOHN
BTW no emisions here or wehre I am going!
#20
#22
Originally Posted by greygooseranger
The smell of a catless mustang or camaro / trans am is really a smell to behold IMO. Hear the pipes ring, feel the ground shake and smell it as it goes by... Man I miss the dream cruise already....lol
#23
Originally Posted by Oh5Edge
So what are you guys doing to gut your cats? I'd like to knock off the last cat after the o2 sensor, but what's the easiest way to do it?
Oh, and I am going to a real fab shop, so he wont ***** that he cant take a cat off or anything.
#24
Originally Posted by DerangedPony
I'm going to just take it out all together and then the fab shop will just start from there. I think, we'll see.
Oh, and I am going to a real fab shop, so he wont ***** that he cant take a cat off or anything.
Oh, and I am going to a real fab shop, so he wont ***** that he cant take a cat off or anything.
#25
I don't recommend removing any emmisions related item but back pressure in the exhaust is never good. Sometimes people misinterpret things like larger pipe = lower pressure so that must be causing the loss of low end torque. I am not going into the dynamics of what causes this loss but removing a cat and relacing it with a pipe the same size as the pipes on either side will not cause a loss in low end torque. However, gutting a cat WILL most likely result in a loss in low end torque.
Removing or disabling the cat will result in higher emmisions under certain conditions and will make the exhaust slightly louder. It will most likely result in no increase in performance due to the better design of todays catalytic converters.
Removing or disabling the cat will result in higher emmisions under certain conditions and will make the exhaust slightly louder. It will most likely result in no increase in performance due to the better design of todays catalytic converters.