just be prepared, if it's your dd, it gets stinky and LOUD
if i have an aftermarket highflow h-pipe with cats, is it worth hollowing those out? it is not stock. i dont think it willl make that much of a difference. someone told me that it could actually hurt me perfomarnce wise.
thanks
I don't get it....everybody complains about the smell. I don't have any horrible gas stink.......
on a stock motor, this is correct, you won't really gain anything.
However, on a full h/c/i bolt on 5.0, that's completely wrong. My friend runs a 5.0 with afr 165's, eddy 2 intake, custom cam, etc etc. He dyno'd it with the HI FLOW 2 catted h pipe, then switched it out for an offroad pipe and picked up 21 hp.
On an engine with mods, running no cats over hi flow cats make a BIG difference in power.
they do, however stink like hell with no cats...and imo is not worth running like that on a street car.
confuses the ecu??? WTF?According to "The Official Ford Mustang 5.0 Technical Reference and Performance Handbook":
"It is illegal to remove either the converters....
because the resulting reduction in back pressure confuses the computer and hurts the engine's low-end torque output. Although some sources have claimed an increase of 10 horsepower when the converters are removed..."
Having too big of a collector or exhaust system will reduce the scavenger effect in the exhaust and can KILL engine performance. An ideal exhaust system is one that has zero positive pressure will net the best performance.
And why do you think the book is incorrect?
In my opinion (and others will argue against this...)
scavenging is VERY different from having a restriction...
Every one will have their own opinion though
What does the ecu see that will tell it the cats are gone?
IF there is a drop in torque, I doubt it is due to the ecu....