Re: [Chevelle-List] The X pipe

[Rob Thorburn]

Hey Larry; I have built several X pipe exhaust systems for different cars.  I have gotten mandrel bends from Hooker headers, and welded custom mandrel bend exhaust systems.  They are the best!  I read a article that the "H" pipe was devoloped for the Hemi engines but lose effectiveness over thirteen inchs in length.  The X pipe is that much better, it is the best possible H pipe in a manner of speaking.  The reason why is: If you think about a Chevy firing order, 1-8-4-3-6-5-7-2, on the left side 5 and 7 fire one right after another, and on the right bank 8 and 4 fire one right after another.  This causes a BIG increase in exhaust pressure on for a short peroid.  The X pipe divides the pressure evenly between the two mufflers.  You can here that the exhaust is quieter and smoother.  It also makes a noticeable increase in HP, even on a stocker.  I am sure as the power goes up the improvement is more dramatic.   Rob '67 Malibu        67' El Camino (in a basket) ----- Original Message ----- From: Larry Williams To: [EMAIL PROTECTED] Sent: Thursday, February 07, 2002 9:20 PM Subject: Re: [Chevelle-List] The X pipe Is this better? ----- Original Message ----- From: Larry Williams To: [EMAIL PROTECTED] Sent: Thursday, February 07, 2002 7:28 PM Subject: [Chevelle-List] The X pipe Did any of you see the article in March Car Craft about the X pipe installation on the mustang exhaust system.  It was a horsepower comparision with the H pipe and open headers.  The X pipe made 335 hp to 323 with the H pipe and 333 with open headers.  Open header made the most torque.  This is second article I have read about the X  pipe.  They seem like a good investment compared to the cost.  Magnoflow sells it for $80. thru retailer muffler shops.  12 hp at the rear wheels increase....  Any thought s?