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post #16 of 19 (permalink) Old 10-06-2017, 04:07 PM
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Re: Need new mufflers

Originally Posted by Yadkin View Post
Had my local guy install them. He put them on "backwards" with center inlet/ side outlet. Borla approves this method, but I was apprehensive.

Idle sound is quiet but awesome. On the throttle and sound level is less but still enough to let the neighbors know you are there. Nice throaty tone- far sexier than the Magnaflows.

The big surprise was on the highway. Cruising at 80, RPMs up to just below 3000, and she's quiet like a mouse. No more drone, and I can use this car for long trips as God intended.
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1970 XL, 351W originally 2V, now 4V
670 Street Avenger, Edlebrock Performer intake, Comp XE262H, Flowtech Headers
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post #17 of 19 (permalink) Old 01-04-2018, 11:16 AM Thread Starter
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Re: Need new mufflers

Here's a video from within the cabin, windows up on a cold day, where you ca hear the new mufflers. Start at 6:20 and watch until the end for a 3-2 downshift and a nice throaty growl.
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1964 Thunderbird 390 V8, AOD, F.A.S.T. EZ EFI 1.0, Victor intake, MSD Ignition.
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post #18 of 19 (permalink) Old 01-06-2018, 07:40 AM
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Re: Need new mufflers

Sounds great, my before and after with the Borlas was Flowmaster 50 series to ProXS as you know, and I was pleased the same way

Plenty of noise when you want, little when you don't. Nice choice!
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70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.
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post #19 of 19 (permalink) Old 02-22-2019, 01:28 PM
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Re: Need new mufflers

I got to say Porter glasspacks are the only mufflers for that year and car. But to each his own.
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