Steve, I called Bora, Flowmaster, and maybe some other muffler companies on size
of exhaust pipe, including the crossover, sound, and fit.
Here is what I found universally from all of the tech guys at the companies, for
my 5.0 L engine.
1. 2.25" is an optimum dimension for the size and rpms to 6500.
2. The cross over pipe or H pipe can be 1 size smaller, on mine that is 2".
3. The 50 series mufflers fit the Tiger, and in either the regular or Delta
they are the quietest.
On performance, the car mags have for years tested various engines and various
mufflers, and the Flowmaster shows the biggest gain.
I have used Flowmaster for years on the Tigers, as noted in my article, and on a
87 Vette. The Vette showed a 3 mpg increase with nothing else, which of course
is an indication of increased efficiency.
So for me, it is a No Brainier on mufflers.
Someone mentioned that sound is like color, and for me I think it is a very nice
compromise.
Larry
Steve Laifman wrote:
> Fmarrone@turinnetworks.com wrote:
> >
> > Steve and all, there has been a lot of talk about the quantity and quality
> > of the sound produced with various muffler configurations with almost no
> > comment on the relative performance obtained by the individual
> > configurations. Anyone care to comment on the relative performance
> > attributes of the various Flowmaster series for instance?
> >
> > Frank
>
> It is my personal belief, based on no personal testing, that a few
> things are clear. The new cars, with all the multiple catalytic
> converters restricting flow, only have an increase in loudness, not power.
>
> On the older systems, like ours, it probably is similar, with maybe 5-10
> horsepower, if you add headers. More would be available with sufficient
> exhaust valve, port work, as this is the weakest link. Modern mufflers
> are not as restrictive as the old ones, and even inexpensive turbo muffs
> give relatively nice sound, are cheaper, and probably do not change
> performance much either.
>
> In any event, the power that would be added is at the higher rpm range, only.
>
> Buy them if you like the sound, or are ready to do everything else in
> the exhaust system to get some more power.
>
> One thing I would NOT recommend is adding pipes larger than 2 inches, as
> you are now slowing the velocity of the exhaust greatly, and the back
> pressure is as low as you would reasonably need at 2 inches.
>
> My $.02
>
> Anyone with measured differences is encouraged to illuminate the rest of us.
>
> Steve
>
> --
> Steve Laifman < Find out what is most >
> B9472289 < important in your life >
> < and don't let it get away!>
> <SLaifman@SoCal.RR.com>
> <http://www.TigersUnited.com/gallery/SteveLaifman.asp>
>
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