[DeTomaso] Muffler Choices

[Ken Green]

Jack,
 
    What I'm trying to understand is if a 2 1/2 inch pipe out of a good merge collector is enough for 425 HP or around there.  I think it is, but I'm not sure.  It should le a lot better than a 2 inch pipe.
 
Ken

--- On Mon, 4/25/11, JDeRyke at aol.com <JDeRyke at aol.com> wrote:


From: JDeRyke at aol.com <JDeRyke at aol.com>
Subject: Re: [DeTomaso] Muffler Choices
To: kenn_green at yahoo.com, detomaso at realbig.com
Date: Monday, April 25, 2011, 12:16 PM


In a message dated 4/25/11 10:31:10 AM, kenn_green at yahoo.com writes:

> Has anyone replaced the collector on headers like these with a good merge 
> collector and maybe just a 2 1/2 or 2 3/4 pipe?  It seems like that would 
> be enough for a moderate street engine?  Going from 2 inch to 
> 2 1/2 increaeses the area by over 50%.
> 
I'm in the process of doing exactly that, Ken. But my Pantera exhaust is 
complicated by the fact that I adapted stock GTS headers to SVO raised-port 
cylinder heads. Due to the 45 degree block angle, the 1-1/2" tall raised ports 
pushes the header tubes outboard enough to hit both the fuel tank and the 
l. & rt. coil-over springs. Heating and bending the 2 offending pipes cleared 
the tank, but I had to re-angle the header flanges to miss the shocks, so 
my upcoming 3" collectors will be curved around the coil-overs using sections 
of u-bends. Then I'll need to build another pair of modified connecting 
exhaust pipes to some aftermarket mufflers. Back in 1990, I should've bought a 
set of headers designed for these heads....
D. Vizard seems to think that shorty-headers (like our GTS's) and long-tube 
headers (with collectors) tend to produce within about 5% of the same 
power, so maybe its not gonna make much real-world difference except visually. 
We'll see. Cheers- J Deryke
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