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Project Shadow - Exhaust
Waiting to Exhale with Exhaust from Edelbrock and Next Generation
August 29, 2007
For increased access to the driver’s side manifold, we removed the steering shaft. This wasn’t difficult to do, and we made sure the wheels were straight and locked the column in position prior to removing anything. This will ensure our steering wheel alignment stays true.
For increased access to the driver’s side manifold, we removed the steering shaft. This wa
With access to the engine, this job starts to get easier. Amazingly, we found reaching the exhaust manifold bolts to be best from the top. We left the plugs in place and made sure we labeled the plug boots as we removed them. Once all the bolts were removed, the driver’s side manifold was carefully liberated from above.
With access to the engine, this job starts to get easier. Amazingly, we found reaching the
The passenger side manifold was likewise pulled out from the top. The only fitting we needed to access from underneath was the rear EGR pipe. This fitting becomes much more important when we begin to reinstall the new headers.
The passenger side manifold was likewise pulled out from the top. The only fitting we need
We took a look at both sides for a comparison between the factory manifolds and the new Edelbrock headers. Edelbrock’s representatives told us that while these headers were a good move by themselves, teaming them with complete full-flowing system all the way back would really show their worth. Again, enthusiasts can upgrade the exhaust as a complete system, or one component at a time based on their budget and labor capabilities. The Edelbrock headers carry PN 6602, and are built from 409 stainless steel. The port flanges are 5/16-inch thick, while the collector flange is 1/2-inch thick. All the flanges are laser cut, while the entire header assembly is robotically-welded for consistency and the highest-quality welds.
We took a look at both sides for a comparison between the factory manifolds and the new Ed
We also took a moment to compare the all-important Y-pipes to each other. We discovered a few notable differences. The factory Y-pipe relies on mounting the catalytic converters close to the manifolds to encourage quick heating and light-off. Our Random Technology replacement uses a pair of smaller cats designed for use further downstream. Because of the factory cat mounts, the exhaust pipes switch sides on the way to the muffler, the Random Y-pipe keeps the sides dedicated. The left header feeds the left cat; the right feeds the right. While the left side is a bolt-on to the Edelbrock header collector, the right side will require fabricating a small extension pipe to mate correctly. More on that later.
We also took a moment to compare the all-important Y-pipes to each other. We discovered a
Our factory cats had seen better days, too. It turns out our driver’s side cat was totally shot, as big chunks of honeycomb fell out upon removal. After adding the supercharger, we’re sure the exhaust temps being fed into this cat were much higher than they were from the factory. Combine this with the hard driving we’ve been doing since the blower install, and you end up with a cat like this. It was obviously time for replacement anyway.
Our factory cats had seen better days, too. It turns out our driver’s side cat was totally
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