"true" dual exhaust...is it better or worse?

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'67 Dart 270

Post subject: Ok

PostPosted: Tue Jan 07, 2014 9:30 pm

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Turbo EFI

Joined: Wed Nov 23, 2011 11:07 am
Posts: 2132
Location: SF Bay Area
Car Model: 67 dart 2 door hardtop

I see, and if the Y to the single doesn't sacrifice power, then why run duals?

Makes sense...

Is there any math behind how long your downpipes run before going into the Y with regard to power, noise or anything else? I've seen the Y pretty close to the dual manifolds and as far back as past the tranny...what's the logic there? I think space is an issue near the tranny, but otherwise is there any gain from closer or further from the manifolds for the Y?

brian

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Aggressive Ted

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PostPosted: Wed Jan 08, 2014 7:12 am

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Supercharged

Joined: Mon Jan 15, 2007 5:05 pm
Posts: 3767
Location: Black Diamond, WA
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My true dual setup sounded awesome at idle and cruising at 60+ mph, but the drone at certain mid-range rpms was absolutely horrible....

This is where the Flow Master HP2's really shine when installed in front of a FM70 or a conventional muffler. They eliminate all that horrible resonance. My system is super quiet and it's 2.5". Performance increase is very good and strong on a tired stock motor.

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Aggressive Ted

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74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG