[Shotimes] Rod shifter/exhaust question

[ROBERT SCHIRMER]

OK, now you got me thinking. I was under the impression that the Y pipe was
NOT a restriction for the ATX cars, cause that Y pipe was larger than the MTX.
Now, if you go to a high flow cat system on a ATX, won't you lose low end
torque if you use a 2 1/2 inch  (OK, partial 2 1/2 inch) cat back system???
  ----- Original Message -----
  From: cmichaelo@optonline.net<mailto:cmichaelo@optonline.net>
  To: Ed Cizmar<mailto:ecizmar@earthlink.net>
  Cc: ROBERT SCHIRMER<mailto:1surferbum@msn.com> ; Ian
Fisher<mailto:dataflash@yahoo.com> ;
shotimes@autox.team.net<mailto:shotimes@autox.team.net>
  Sent: Thursday, October 28, 2004 1:26 PM
  Subject: Re: [Shotimes] Rod shifter/exhaust question


  Ed,

  Here's a relatively cheap way to fabricate an "optimal" 2 1/2" catback
system for the SHO.

  First, I'd buy the Dynomax system, which is basically a 2 1/4" system,
though with a 2 1/2" piping used for the snake section.  I would then drop the
2 1/4" resonator section and have that section custom fabricated in 2 1/2"
piping with your own personal resonator (many seem to prefer Magnaflow.)

  The Dynomax snake section is already fabricated in 2 1/2" piping, so you're
ok with that piece. The only caveat is that the branch section of the Dynomax
catback is fabricated in 2 1/4" piping.

  However, IMO this won't hurt mid/high-end performance since by the time the
exhaust gases reach the branch section the velocity and volume of the gases
have sufficiently decreased and thus no longer require 2 1/2" to flow freely.
In fact, you may even benefit from keeping the branch section at 2 1/4" since
it will increase back pressure at lower RPMs.

  So I kind of view this "home made" exhaust as the optimal exhaust for the
SHO.

  Going 2 1/2" all the way, will hurt low-end performance. Everyone seems to
have noticed this. But by compromising right in the middle, and gradually
decrease the cross section as you move further backwards, I'm hoping this
solve this deficiency somewhat.

  Be adviced, however, that if you have a 2 1/4" Y-pipe outlet, you won't
benefit anything from the 2 1/2" catback. You'd have to cut out the 2 1/4"
Y-pipe outlet and have a 2 1/2" outlet welded in. (If you're interested, I can
tell you more about how exactly to do this, cause I just did it.)


  Michael
  94MTX,green,BOS+,Koni/Intrax,Baer,Corbeau
  SHO items for sale:
http://hometown.aol.com/cmichaelo/for_sale.html<http://hometown.aol.com/cmich
aelo/for_sale.html>
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