Vance and listers:
An exhaust upgrade was part of my recent engine rebuild/improvement. I now
have the 6-3-1 Moss Europe pulse header that ends in a 2 1/4" outlet. I did
not want the obnoxious sound of the free flow systems available, so we
modified the stock stainless muffler. I ground away the weld of the inlet
pipe of the muffler. The inlet pipe is also attached at the other side of
the muffler, so we used some big wrenches and twisted the pipe back and
forth until the bottom weld broke off and removed the entire pipe. The car
was then taken to a tire shop that did custom exhaust work. They ran a 2
1/4" pipe in two pieces from the header to the stock exhaust that they
modified with a bigger inlet pipe. The sound is throaty-er, but not nearly
the loudness of the free flow systems that I have heard. The new inlet pipe
does not go in very far and should not be as restrictive as the stock set
up. We hoped that the two outlet pipes would help minimized the bottleneck,
but any time the exhaust has to turn 90 degrees, there's going to be some
restriction. Total cost of the tire shop work was about $200.
Andy
CD6746L
----- Original Message -----
From: "Navarrette, Vance" <vance.navarrette@intel.com>
To: <6pack@autox.team.net>
Sent: Thursday, August 04, 2005 12:08 PM
Subject: TR6 mufflers
> Listers:
>
> A question for all of you out there. Has anyone found a "look
> alike" TR6 muffler that flows worth a rip?
> I was chasing an exhaust leak on my new exhaust system, and out
> of morbid curiosity I looked at the inlet pipes on my '74 muffler. It's
> a miracle that the car runs at all with the stock muffler. There are a
> handful of tiny perforations in the sides of the inlet pipes going into
> the muffler. The end of the inlet pipe is
> completely blocked. I bet there is less than 1 square inch of open area
> for each of the inlets, and it is all on the sides of the inlet so that
> the gas needs to make a right angle turn through a tiny hole. This is
> compared to a cross sectional area of 2.25 square inches PER PIPE on my
> '74. The manifold and pipes are all smoothly bent, nice flowing pieces,
> but the muffler is garbage.
> Holy constipation, batman! That stock muffler is a LOSER for
> horsepower. I would like to keep the stock look, so I was wondering if
> anyone had a bolt in replacement that they would recommend. I suppose I
> could cut one open, hog out the innards a bit, and weld it shut. Seems
> like a lot of work.
> Another thought was to go to a custom exhaust shop and have them
> fabricate something that looks stock. I thought a 1 inlet / 2 outlet
> Sonic Turbo or Dynomax muffler, with some fabricated adapters, could be
> made to look stock from the rear of the car (i.e. have a pair of those
> gorgeous outlet pipes made for the non-stock muffler).
>
> Anyone out there played with this issue? Any neat solutions?
>
> Thanks,
>
> Vance
>
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