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Old 11-16-2009, 09:19 AM
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Turbo Mufflers

As I said in another post, I am looking for a single inlet dual outlet for my 91 chevy pickup. It currently has the stock exhaust that has to be very restrictive. Next year I will be putting a 350 in with a mild cam and possibly headers so whatever muffler I pick I do not want to be much louder than stock until I really get on the gas.

My father's chevelle basically has the volume I'm looking for but it has a 454 in it which will probably sound good regardless of the muffler. I looked this weekend and found out it has dual 2 1/4" hooker super competition (turbo?)mufflers. They don't make these mufflers with a 1 in 2 out system so I'm wondering if summit turbo mufflers will sound similar?

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Old 11-16-2009, 07:32 PM
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Anyone have experience with turbo mufflers?
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Old 11-16-2009, 11:23 PM
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Most any Turbo muffler sounds about the same. You could look for Dynomax Super Turbos or the Hooker AeroChamber for the 1 in-2 out configuration also.
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Old 11-17-2009, 04:30 PM
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You'll have to shop around. Like any mufflers, there are good ones, and there are 'not-so-good' ones.

The above recommendations are good. Turbo mufflers are supposed to be low restriction with quieter performance. Flowmasters offer less noise, with more performance.

Most of the muffler companies offer testing, comparisons, etc. to let you know how their mufflers stack up to stock. But, I don't know where to tell you to go TODAY to find a comparison of different brands of aftermarket mufflers. I saw one several years ago, in HOT ROD, but I'm sure technology has made improvements, so it's probably obsolete.
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Old 11-17-2009, 09:21 PM
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http://www.pirate4x4.com/tech/billav...urbo_specs.pdf is part of an old Dynomax catalog that lists specs for their Super Turbo mufflers. There should be something in there that meets your needs. The "sport" & "street" are relative noise levels, and the numbers underneath are horsepower capability in single/dual applications.
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Old 11-18-2009, 03:06 AM
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Im running a set of turbos now and they sound decent. Nice rumble but not too loud. I am upgrading to flowmasters here soon. Most any sound will also depend on engine performace too.
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Old 11-18-2009, 07:00 AM
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I've got Summit $17 3" turbo mufflers on my blown SBC and they sound great. I don't think there is much restriction.

Offset inlet and ofset outlet.
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Old 11-18-2009, 07:52 AM
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I ordered the kit off Summit Racing with the summit turbo muffler. hopefully it will give me what I'm looking for
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Old 02-03-2010, 09:51 AM
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I finally put this on and like the sound at idle and while rev'ing in park but then while driving it gives like a ratling/crackling sound. What could be causing this?

I ditched the cat when I installed it (will be putting a new one on soon) and the pipes are not hitting anything. My engine uses a little bit of oil as is probably typical for a tired 305. Stock manifolds/Ypipe and engine.
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Old 02-03-2010, 12:31 PM
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Many times, cackling is caused by an air leak somewhere in the system.
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Old 02-03-2010, 01:01 PM
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You mean an exhaust leak or a vacuum leak?
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Old 02-03-2010, 02:48 PM
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Exhaust. There are sometimes places in a system where they can suck air, but not leak exhaust. If the system is pulling in fresh air anywhere, that can cause it to crackle.
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Old 02-03-2010, 10:27 PM
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yeah, that's unusual. Mine sounds like thunder even under full power. You can hear it a couple blocks away.

You may need a cross over pipe to even things out.
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Old 02-04-2010, 04:55 AM
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This is single in dual out setup so a x pipe won't help
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Old 02-07-2010, 05:55 PM
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I use a pair of Dynomax UltraFlow 'straight thru' glass pack mufflers and they are super quiet while cruising and have a nice muscular tone when I'm on it.. m ight want to check into one of those. should be even quieter with a single-in.. but i'm not sure what you could do about the dual-out thing...
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