which 3'' exhaust do i want?
i definately agree with the header size affecting low end torque thats a given, but usually don't you gain that at the top ?
by the way guys, not that i don't want to get to the bottom of this, but the original question was who makes the best fitting kit.
And in killing 2 birds with one stone....heres the throw....
I have a 2-1/2 jegs/sumitt system. Well fitting and easy to assemble. A most minor issue was 1 pipe didn't want to slip into the next pipe. A tool I have from Lesile, a pipe expander. Easy fix. Though if I didn't nimd starting up the car to heat the pipe up and expand it that way and shove in a cold pipe. Once there together though, that's it.
I may not have killed the first bird, but thats my testimoney.
Richoet to the next bird.
Though you should gain top end power, this is often seen at the dyno. Actual track runs can show this as well. But when is it too big?
Exhaust will travel fastest when hot. It will travel faster in a small pipe that has no pressure. If the bigger pipe has a reduction in heat, a bennifit still may be seen through volume. Which is the catch 22 of exhaust.
There are pressure meters for exhaust pipe.
Header size can be scienced out. Tube Diameter and length are a changing item for what the need is.
On a street car, a general size for given horse power is made by the companys and they cn suggest a exhaust pipe size for a given HP. That size can change for driving the streets or track use.
Flowmaster has a chart for pipe size for given HP in both dual and single pipe.
(Hummmm, I think that might have been a second richoet)