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914World.com _ 914World Garage _ Changed my exhaust

Posted by: drew365 Jul 19 2003, 07:29 PM

I had two Flowmasters on my car. I always loved the sound but I also had a pair of Supertrapps and I wanted to try them out for the track. The Flowmasters were very loud, I set off alarms on pretty much every street I went down. I was afraid that the Supertrapps would be louder but they are actually much quieter even with all the plates in place which is supposed to be the loudest. I had flanges put on all four mufflers so I can interchange them. I'm thinking of going to a dyno shop and getting a reading with each muffler. Anyone have any bets on which will give more horsepower to the engine? Has anyone played with the number of plates on Supertrapps and can you tell much difference?

Posted by: -P- Jul 20 2003, 12:26 AM

I believe removing the discs increases the sound.

Posted by: ! Jul 20 2003, 08:26 AM

Nope....removing increases back pressure and quiets it...more discs the louder and freer flow it has.....

Posted by: drew365 Jul 20 2003, 12:58 PM

The instructions say: Less discs, quieter and more low end power. More discs, louder and more top end power. I'm going to experiment on the track to see if I can feel the difference but I'm kind of curious to see a dyno print out. One with the Flowmasters, one with the Supertrapps with no discs and one with all the discs. Anyone that has any experience with the Supertrapps I'd like to hear about it. I'll let you know if I get to the dyno this week.

Posted by: ! Jul 20 2003, 01:03 PM

No dyno numbers......just seat of the pants. I added two discs to get a total of 12 on my dual outlets for my 3.6 motor.....the T-4 was running 8 discs for the single stinger. Seemed a good compromise.

Posted by: Brad Roberts Jul 20 2003, 01:04 PM

We have tested all the combinations with SuperTrapp.. NO difference on a 8k RPM race engine. We where however using a 4 into 1 setup.

They are seriously designed for motorcycles where you can really adjust the torque band.

Let us know what you find.. we run one for Laguna Seca (92DB) and Sears Point. I hate it.. but it works to keep the noise down.

B

Posted by: BravoHotel Jul 22 2003, 09:30 AM

Drew,

Can you post some b4 and after pics. Flowmasters v. Supertrapp...

BH

Posted by: fuch toy Jul 22 2003, 09:33 AM

Yeah....the discs are a bitch to get off w/o using antisieze, byt then again any muffler bolt is like that. As to the chrome flaking off...mine are stainless steel....

Posted by: drew365 Jul 22 2003, 05:07 PM

I just looked at the original mufflers and they are MagnaFlow not Flowmaster. Sorry for the misinfo. The name was on top and I was told they were Flowmasters. Here is a pic of the Supertrapps.

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Posted by: drew365 Jul 22 2003, 05:08 PM

And a close up:

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Posted by: drew365 Jul 22 2003, 05:11 PM

Here are the MagnaFlows the way they were originally mounted. They have been reworked so they will come straight out like the SuperTrapps now. These are much louder than the SuperTrapps even with the 15 disks that are on the SuperTrapps.

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Posted by: drew365 Jul 22 2003, 05:12 PM

Here is the MagnaFlow off the car.

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