[DeTomaso] Removing ANSA resonator tips?

[Terry Appleby]

Downloaded from the net -
March 6, 2010 - Update
After giving more thought to my muffler modification, I decided to take it a
step further by cutting 1 3/8" holes in the muffler tip cap and the front
and back baffles.  A total of six cutouts per muffler.  The 1 3/8" cutter
fits inside the tip with just enough clearance to make the turn into the
perforated part of the pipe.
I used the following Ace Hardware tools to cut the holes:
1. 1 3/8" wood and metal hole saw - part number 20223 - $10.49.
2. Vermont American mandrel that matches the hole saw - part number 25536 -
$16.99.
3. Starrett 12" mandrel extension - part number 206103 - $23.49.
To make sure that the cutter did not get disconnected from the extension I
cut a notch in the mandrel shaft and replaced the straight slot set screw
with a hardened hex head set screw so I could really torque the set screw
down very tight. Having the cuter get disconnected from the extension inside
the muffler would be a major problem so be very careful.  I retightened
everything after each cut and used oil on the cutter teeth.  Most of the
cutout parts stuck to the cutter teeth when I pulled it out of the muffler.
A couple are still in the muffler but they don't seem to be rattling.
The following are my area calculations for the openings in the muffler:
1. Main 1 3/4" OD tailpipe that connects from the header to the front of the
muffler has a ID area of about 2.074"..
2. Perforated main pipe inside the muffler has about 210 3/16" holes for a
total area of 5.88".  I don't believe a perforated pipe would actually flow
like it had an area of 5.88".
3. The two 1 3/8" holes that go from the exhaust tips through tip plug and
both baffles. The total area of both holes is about 2.97".
After cutting the large holes I found that there was some steel wool left in
one of the mufflers and I was able to pull it out in pieces.
The larger holes made the exhaust somewhat louder and the exhaust has a bit
of a bark to it now at RPM.  The system has lost a lot of the characteristic
ANSA airy sound.  At this point the muffler should not be creating much or
any restriction when you consider the small size of the inlet.
Images of the tools.

I expect that I'm getting the best flow possible now, without cutting the
muffler apart and removing the perforated pipe and baffles.
It is kind of hard to see with the flashlight in the way and the poor camera
focus, but in this image you can see with the 1 3/8" cutouts there is a
clear view all the way to the front surface of the muffler from inside the
exhaust tip.


-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of MikeLDrew at aol.com
Sent: 2012-08-15 22:18
To: detomaso at realbig.com
Subject: [DeTomaso] Removing ANSA resonator tips?


Hi guys,

Has anybody successfully removed ANSA resonators from the tips, leaving
just the chrome tips?   The resonators provide quite a restriction to
exhaust
flow, and Andy in the UK (he of the launching GT5-S) is looking for cheap
horsepower.   I seem to remember somebody successfully doing the job with a
holesaw with the mufflers still on the car?

Mike
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