How much HP difference do mufflers make?

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Mar 5, 2002 | 08:40 PM

damac

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How much HP difference do mufflers make?

I am upgrading my stock squared off 2.5 inch exhaust on my 65 sb coupe to a true round 2.5 inch system with an X-pipe. I am currently running Dynomax trubo mufflers that flow 370 cfm (per dynomax). Dynomax told me that the ultraflow mufflers will flow 1,100 cfm. I am running a pretty healthy 406 (see sig).

Is it worth the $$ to upgrade to the ultraflows? The flow #'s sure seem to say so, but I don't know how much flow I need to support my 406.

Thanks,

Mike

Mar 6, 2002 | 01:16 AM

Les

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From: Sierra Foothills CA

Re: How much HP difference do mufflers make? (damac)

I'm running 2 1/2" in & out SS Ultraflos & am very happy w/ them. I definitely felt the difference between them & the turbo type muffs that they replaced. The SS type is pretty expensive due to the finish but you can now get the same muff w/ standard finish for a pretty good price. FYIW, the sound is just what I was looking for- raspy burble at idle, quiet at cruise, & nasty when you hit the throttle.

Mar 6, 2002 | 11:22 AM

damac

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Re: How much HP difference do mufflers make? (Les)

Les,

Thanks for the info. That sounds like the exhaust note I am looking for.

Mike

Mar 6, 2002 | 11:28 AM

Aaron-74

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Re: How much HP difference do mufflers make? (damac)

Here are my mufflers.

Dyno Max Race Magnum Bullets. I don't know what CFM there flowing, I don't know but it seems like they would flow a LOT! :cool:

Mar 6, 2002 | 11:29 AM

Aaron-74

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Re: How much HP difference do mufflers make? (Aaron-74)

http://www.aaron74.homeip.net:81/Sound/beast.wav

what they sould like.

Mar 6, 2002 | 11:39 AM

damac

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Re: How much HP difference do mufflers make? (Aaron-74)

Aaron-74,

I am glad I am not your neighbor.

Those pipes must be pretty loud.

Mike

Mar 6, 2002 | 12:02 PM

Aaron-74

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Re: How much HP difference do mufflers make? (damac)

There going to be REALLY REALLY loud. But, I am planning on having an H-pipe some where on the system. I don't know if I want to do it closer to the headers and get more power, or closer to the tips and soften it down a little bit.