Flowmaster 70's

[Bud]

Do anyone have Flowmaster 70's on

their 8.1? Tell me what you think.

 

Bud

[Z71-cummins]

i got that muffler on my 5.7. I havent been dissapointed i enjoy the sound nice and melow and sounds awesome goin up hills. Youll here folks say magnaflow but nothin sounds better than a flowmaster.

[Wingnut]

i got that muffler on my 5.7. I havent been dissapointed i enjoy the sound nice and melow and sounds awesome goin up hills. Youll here folks say magnaflow but nothin sounds better than a flowmaster.

 

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I have both, and they both have their goods and bads.

 

I've got the 40 (maybe 50, I'm not 100% sure) series on my '92, and it's pretty d**n loud, but sounds awesome with the pipes just dumped over the rear axle. But I rarely drive that truck, so the loudness is no big deal.

 

I've got a Magnaflow welded in place of the stock muffler on my '02 and it's pretty quiet 90% of the time, which is exactly what I wanted for my daily driver.

[3500in nc]

not runnin a 70 but with 2 3inch 40s that 8.1 is a monster and gives what i think is a great sound

 

not the loudest truck but i had to put somthin on other than that factory muffler to open up the true duals from the headers back

 

 

all mufflers are (good) in alot of different ways it all depends on how long ur planning on keeping your truck and also how loud you want it

[agoody68]

I am running a set of 70 series on my 2001 GMC 2500 HD 6.0L. I AM VERY HAPPY

[Superman TNT]

 

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I have both, and they both have their goods and bads.

 

I've got the 40 (maybe 50, I'm not 100% sure) series on my '92, and it's pretty d**n loud, but sounds awesome with the pipes just dumped over the rear axle. But I rarely drive that truck, so the loudness is no big deal.

 

I've got a Magnaflow welded in place of the stock muffler on my '02 and it's pretty quiet 90% of the time, which is exactly what I wanted for my daily driver.

 

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Hey Wingnut,

What Magnaflow do you have? I would like a bolder sound but I don't want it really load. I am interested in picking up a little low end (even though I have the 8.1). I don't mind it getting a little loud when I really get on it. But like you I'd like it a little quieter most of the time.

 

Also, are you runnign an after market cold air intake? If so which one?

 

Thanks,

 

TNT

[Mungo]

I'd be interested in hearing what people thought as well. I just had a 50 series Delta installed on my 6.0L Monday and I think it is a little loud for my taste. I am thinking about going to the 70 but want it to be more aggressive than stock. Anyone heard the 50 BB vs the 70 BB?

[busta]

70 series all the way. Had it on my old 88 GMC 1500 and the sound was incredible. Just waiting to put them on my new to me truck. Have to do a few more upgrades first.

[cwh]

bud,

I guess that I'm the only one that runs a 70 series flowmaster with an 8.1L. It sounds great. Its not very loud, just a deep growl. Interior noise is much lower than with a 40 or 50 series. I've owned and installed many flowmaster systems and you just can't go wrong. The 70 series is the muffler to have if you want to keep the interior noise down.

 

cwh

[johnandchrisinmo]

trying ot find a 70 series for an 03 6.o liter. mufflershop that did the work on son's 94 5.7 says that no 70 series for the 03 50 series only thing he can get and not wanting any louder than the 94 is

[3500in nc]

trying ot find a 70 series for an 03 6.o liter. mufflershop that did the work on son's 94  5.7 says that no 70 series for the 03 50 series only thing he can get and not wanting any louder than the 94 is 

 

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this may sound stupid but y not just by the 70s and have the shop fab up some tailpipes???

 

just my 2cents

[Mungo]

I have an '05 with the 6.0L and put a 50 Delta Flow on last monday and there was simply too much cabin drone for me. Went back this morning and they put on the 70 Big Block II. Took them 25 minutes total. I went DI/SO and used the stock Denali tip.

 

Ironically, I called Flowmaster the other day and they said that the 70 doesnt fit. I dont know how it couldnt fit. The stock muffle could have a dead body in it its so large. The 70 works and I really liek the sound. Nice deep, but mellow rumble, at idle. Its deeper than stock but not as raspy as the 50 DF. I did love the raspiness of the 50 DF but the resonance was just too luch with the 6.0.

 

The p/n for my 70 is 52573 although I have a dual in and online this reflects SI/SO.

[johnandchrisinmo]

trying ot find a 70 series for an 03 6.o liter. mufflershop that did the work on son's 94  5.7 says that no 70 series for the 03 50 series only thing he can get and not wanting any louder than the 94 is  

 

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this may sound stupid but y not just by the 70s and have the shop fab up some tailpipes???

 

just my 2cents

 

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No 70 series with dual 3"in and Dual 3"out hard to fab to it if it dont have enough inlets and outlets

[3500in nc]

this may sound stupid but y not just by the 70s and have the shop fab up some tailpipes???

 

just my 2cents

 

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No 70 series with dual 3"in and Dual 3"out hard to fab to it if it dont have enough inlets and outlets

 

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y not just put 2 single in/out side by side???