Power gain with exhaust?
05-31-2012, 12:19 PM
#2
Truthfully, not much. Cat backs can gain a little, but if you're doing it only for power you'll be disappointed. On the dyno we see 5-10hp gain with a 3" on the 5.4L, but these gains are mostly in the +3000 rpm range and are hard to be felt on a heavy truck.
05-31-2012, 01:28 PM
#3
When I was into building cars I would always tell it like this to people asking the same question.
You put huge exhaust pipes on a vehicle and do not increase the amount of air going into the motor you will lose some back pressure. This isn't going to make anything go faster but this is also considering you changed manifolds to header and did a header back exhaust.
If you put a cat-back you're biggest increase is coming from the more opened muffler becuse the piping between the motor and beginning of cat-back didn't change so there really isn't much difference at all.
What you are doing when putting an exhaust on is helping your vehicle for future mods.
You can't increase the air to the motor without increasing the air coming out or you will not see as much of a gain.
So, basically, an exhaust helps you when modding your motor, but not really a performance mod entirely on it's own.
That make sense?
You put huge exhaust pipes on a vehicle and do not increase the amount of air going into the motor you will lose some back pressure. This isn't going to make anything go faster but this is also considering you changed manifolds to header and did a header back exhaust.
If you put a cat-back you're biggest increase is coming from the more opened muffler becuse the piping between the motor and beginning of cat-back didn't change so there really isn't much difference at all.
What you are doing when putting an exhaust on is helping your vehicle for future mods.
You can't increase the air to the motor without increasing the air coming out or you will not see as much of a gain.
So, basically, an exhaust helps you when modding your motor, but not really a performance mod entirely on it's own.
That make sense?
05-31-2012, 06:49 PM
#6
-brad
my 2004 5.4L had 4 cats. i took two off, since 2 is good enough. then with the 3" pipe the rest of the way i have fantastic highway mileage and more top end accelleration
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05-31-2012, 11:52 PM
#8
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I'm going to have to check the manufacture again to be sure but the parts store gave me a quote on a 3 in cat back exhaust for 500 bucks. And I only have 2 cats since I have an 07.