[Shotimes] Walker cat-back smaller than expected.

[Rick Glass]

True dual 2" pipes on my (former) '94 was horrible, absolutely no torque.
I gutted the cats and put the rest of the stock system back on.


Rick Glass
           Nashville, TN
'99 Silver 40k needs to be Kirked
      Flowmaster Original 40's
      3rd cat/resonator removed
      Intake slightly modified, but not Porterized
----- Original Message ----- 
From: "Michael" <molsen@excite.com>
To: <shotimes@autox.team.net>
Sent: Monday, January 12, 2004 2:57 PM
Subject: [Shotimes] Walker cat-back smaller than expected.


> Hi, I just realized, after having used it for 4y now, that the
Walker/Dynomax cat-back is actually only a 2.25" system, and not a 2.5"
system as I had thought all along. Also, the output pipe of the HiFlow cat
is only 2.25". According to some flowdata that I saw, a 2.25" single-pipe
system will definately restrict the flow of even a slightly modified SHO.
Not by a lot, but it's not optimal.This latest "revelation" makes me wanna
try to make a custom 2.5" exhaust system as follows: 1. move the rear cat 6"
further back to optimize its position. (Apparantly, 12-18" from the exhaust
manifold opening is optimal for a 2.25" cat.)2. replace the two rear cat
pipes with 2.5" pipes.3. make a more tapered merging of the two rear cat
pipes.4. drop the resonator.Have any of you done something similar? Any
comments appreciated. I expect to gain about 5HP from this. I like the
single-pipe configuration, and don't wanna go to dual-pipes. Dual-pipes is
too much work, and the consensus, I be!
> lieve, is that I would loose too much back pressure and thus torque at
low-RPM. Michael94MTX,green,BOS+
>
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