[Shotimes] Rod shifter/exhaust question

[Ian Fisher]

FWIW, my entire system is 2.5" with 2.25" mufflers. It
was stupid but I wanted to use the tips and they were
2.25" only. I haven't noticed and loss of low end
(seat of the pants) but mid and top end seemed to have
increased.

I would recommend painting all of the pipes with a
high temp paint. The shop that did my catback (most of
it is aluminized) painted it high temp black. It has
actually held up very well and I haven't noticed any
serious rust. May be a good idea to paint the inside
of the pipe as well. It'll burn off at the front of
the catback where it gets hot but if you have a normal
SHO, the oil leaks will prevent too much rust anyway.

Ian

--- cmichaelo@optonline.net wrote:

> 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
> 
> 


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