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stealthfti | all galleries >> Galleries >> the Sarah Project > over the axle
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over the axle

After the Ultraflow, I used two mandrel bend pipes to go over the axle. I joined them above the axle with another S/S band clamp. This will facilitate any repairs, or any need to disassemble or remove the exhaust system in the future.

The rear muffler is a Dynomax super turbo 4.5x9 oval muffler; held in place with a modified stock muffler mount.


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stealthfti24-Apr-2006 03:53
David, A Moroso Spiral Flow [as the front muffler] and a Dynomax Super Turbo [as the rear muffler] will do the job on the quiet, for the most part. Straight through mufflers are too noisy. Chambered mufflers, like the Dynomax turbos, break up the sound waves because of the way they are built...the internal baffles. The Moroso Spiral Flow has internal vanes that act to disrupt [break up] the sound waves.
For the most part, 'drone' is something else. While related to the size of the piping in the system, most of the 'droning' is related to the size of the tailpipe outlet. Think of ricers with their fartcan tailpipes.
To reduce the drone, you reduce the size of the outlet. A good way to do that, without restricting the flow, is to use a dual outlet tip, such as a Hedman Hedders Hottip, that has smaller diameter outlets than the inlet. The two smaller diameter pipes do a lot to cut drone...the opposite of what the ricers do.

It will be a while before I fab the 3in 700 systems. When I do, I will put up a gallery on the project. Working out the details for the downpipes is where things are at right now.

There are people who make and sell 3in downpipes for 700s and 900s. I want to build my own; so that I can get the location where I want it, and the routing for the rest of the system will line up easier.
david 23-Apr-2006 07:00
Thanks for sharing with me the tricks of your trade. I was all excited and about to order the kit when I got to the part of your response about 3 inch exhaust. What mufflers do you think will be up to the tasks of quieting the 3 inch system. I have read that wagons, because of their large interior volume, tend to resonate more with a 3 inch system. Some have even suggested having the tail pipe stick out a little more.

I had a 1982 Saab Turbo, (a very nice car with APC and all)which had this very irritating drone at 60 mph. Exhaust was factory and car was pretty much new (2 year old)but that drone and highway speeds, drove me to sell the car.

Will be waiting with baited breath on your execution of the 3 inch system. I am sure it will be well thought out, efficient and yet stealthy
stealthfti22-Apr-2006 00:48
David, the S-bends are Flowmaster brand 14 ga aluminized. They are available in a kit called the 'universal intermediate pipe kit'. The kit has 6 pipes total: 2 each of 4in offsets, 6in offsets, and 8in offsets. And are available through a good speed shop.

The kit used for these 2.5in systems that were merged from the stock DP worked out well. The first S bend going into the front muffler is a 4in offset bend pipe. The one going from the front muffler over the axle is one of the 8in offset bend pipes. And the one going down into the rear muffler is one of the 6in offset bend pipes. Which means that one kit supplies enough bends to do two cars.

The SS band clamps are Walker MegaClamps. They ARE nice to use.

I've done three 765T wagons this way: stock DP into 2.5in. It is and was a considerable improvement over the stock system.

But, 3in turbo back is better. MORE flow; LESS restriction; FASTER spool. And I will be fabbing up 2 full systems using the 3in version of the Flowmaster pipe kits along with some other bends for the 3in DP. The 3in bends are similar to the 2.5in bends only insofar as to the amount of offset, but not the angles of the bends, making them different enough that I know that it will take some work to fit everything in there. The Flowmaster 2.5in pipes worked out so well that it was like Flowmaster came up with that 2.5in pipe kit JUST for me. It was perfect for a 700 system.

Besides the size of the pipes [with 3in being the best way to go], the way to have the good flow and yet retain some quiet is to use two mufflers. I have proven to myself a few times that with a single muffler you have a choice: flow or quiet. You cannot get both from a single muffler.

You can have the flow and keep the quiet with two mufflers.

Flow [3in] AND quiet [two mufflers] is the stealthy way.

David 20-Apr-2006 09:04
I love your exquisite but yet simple solution to the exhaust. I am pretty new to this and would like to know where you got the mandrel S bend to solve the over the axle problem (would appreciate info on the vendor and what to look for). I especially like your use of the clamps which makes repairs or changes easy without the need to weld. This is a superb exhaust system for the DIY folks. What is the gauge of steel that you use 16 or 18 gauge. I have a 91 945T. If a choice would you go for a 3 inch CAT back exhaust or a 3 inch down pipe.

Cheers
David

Excellent site and very well written.