exhaust question - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tim21391 · 02-24-2010, 08:07 PM

i graduated hs in may..

glider_6969 · 02-24-2010, 09:35 PM

Quote:

Originally Posted by allthrottle,nobottle

which specific mufflers do you have?

They came as part of the Kit, measure about 4 X 9 offset stainless mirror ovals. Check out the magna flow web site, that might help too.

**70cst** · 02-24-2010, 10:14 PM

I wish I could say that.... Yes I do have an answer to your question but I don't. But it is great to see all the input on your question.

'72customdeluxe · 02-24-2010, 11:07 PM

one of my new magnaflows then flowmaster

allthrottle,nobottle · 02-25-2010, 12:04 AM

magnaflow may make a better muffler but i sure do like flowmaster's website better. i wish magnaflow had a chart that showed their mufflers in line from quitest to loudest...

'72customdeluxe · 02-25-2010, 12:14 AM

loudest (other than race mufflers, 6" long I believe) is the 4x14 cylinder shaped. Quietest is whatever is biggest. Ovals will be quieter than cylinders. Flowmaster doesn't show decibals either, so what I said is about the same accuracy.

allthrottle,nobottle · 02-25-2010, 12:21 AM

Quote:

Originally Posted by '72customdeluxe

loudest (other than race mufflers, 6" long I believe) is the 4x14 cylinder shaped. Quietest is whatever is biggest. Ovals will be quieter than cylinders. Flowmaster doesn't show decibals either, so what I said is about the same accuracy.

where do you find decibals on magnaflow site? that sounds very helpful

'72customdeluxe · 02-25-2010, 12:53 AM

I don't think you can find db's on magnaflow. I was just saying flowmaster doesn't list db's either so their method of rating how loud a muffler is is just by comparison. Because you're going to run cutouts i'd just measure a couple times and order the biggest ones that will fit. It'll be stealthy.

tim21391 · 03-04-2010, 02:27 PM

why spend $27 when i already have the stuff laying around

'72customdeluxe · 03-04-2010, 09:16 PM

Quote:

Originally Posted by tim21391

i have flowmaster original 40s on mine.. and flowtech longtube headers on my 402.. and where my collectors are im going to take a saw zaw and from the collector go back about 6"-a foot and then put another collector back there to make my own cutout so i dont got to spend the big bucks on actual cut outs..

that's great making it yourself, was just letting you know they're pretty cheap if that's an attractive option to you

allthrottle,nobottle · 03-04-2010, 09:23 PM

Quote:

Originally Posted by '72customdeluxe

that's great making it yourself, was just letting you know they're pretty cheap if that's an attractive option to you

how much money are you considering cheap? and where can you find cut-outs cheap?

'72customdeluxe · 03-04-2010, 09:36 PM

Quote:

Originally Posted by '72customdeluxe

Lol wut, cutouts 27$ summitracing.com/parts/SUM-670136/

not the electric mechanisms, just the cutout itself. I would suggest looking at ls1tech.com for prices and opinions on cutouts

allthrottle,nobottle · 03-06-2010, 04:50 PM

Quote:

Originally Posted by '72customdeluxe

not the electric mechanisms, just the cutout itself. I would suggest looking at ls1tech.com for prices and opinions on cutouts

oh yeah the actual cutout is not an issue, im worried about the 250+ dollar electric mechanism

02-24-2010, 08:07 PM	#51
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: exhaust question i graduated hs in may.. __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796

02-24-2010, 10:14 PM	#53
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,339	Re: exhaust question I wish I could say that.... Yes I do have an answer to your question but I don't. But it is great to see all the input on your question. __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

02-24-2010, 11:07 PM	#54
'72customdeluxe Registered User Join Date: Jan 2008 Location: Tejas Posts: 691	Re: exhaust question one of my new magnaflows then flowmaster Attached Images __________________ '72 cheyenne super step, '05 long bed gmc

02-25-2010, 12:04 AM	#55
allthrottle,nobottle Registered User Join Date: Jan 2008 Location: texas Posts: 119	Re: exhaust question magnaflow may make a better muffler but i sure do like flowmaster's website better. i wish magnaflow had a chart that showed their mufflers in line from quitest to loudest...

02-25-2010, 12:14 AM	#56
'72customdeluxe Registered User Join Date: Jan 2008 Location: Tejas Posts: 691	Re: exhaust question loudest (other than race mufflers, 6" long I believe) is the 4x14 cylinder shaped. Quietest is whatever is biggest. Ovals will be quieter than cylinders. Flowmaster doesn't show decibals either, so what I said is about the same accuracy. __________________ '72 cheyenne super step, '05 long bed gmc

02-25-2010, 12:53 AM	#58
'72customdeluxe Registered User Join Date: Jan 2008 Location: Tejas Posts: 691	Re: exhaust question I don't think you can find db's on magnaflow. I was just saying flowmaster doesn't list db's either so their method of rating how loud a muffler is is just by comparison. Because you're going to run cutouts i'd just measure a couple times and order the biggest ones that will fit. It'll be stealthy. __________________ '72 cheyenne super step, '05 long bed gmc

03-04-2010, 02:27 PM	#59
tim21391 Registered User Join Date: Jul 2007 Location: Salina, Kansas Posts: 1,998	Re: exhaust question why spend $27 when i already have the stuff laying around __________________ 1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796



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