50 or 70 Series Flowmaster???

SportyShorty · June 23, 2003

I have been wanting to put a catback system on my truck for quite some time now. The only thing that I worry about is the noise levels inside the cab. I have a standard cab with a short bed 99 Silverado. I was thinking about getting the 50 series Flowmaster but am not sure about the noise levels. It must sound pretty sweet outside but what about inside. I don't want anthing that will be annoying to listent to and cause me to hate it. Flowmaster says that the 70 series is almost as quiet as stock. To me this is the way to go if I dont want all the interior noise but will I be wasting my money on a muffler that dosent make any noise? Any input is appreciated.

3500duramax · June 23, 2003

I have american thunder cat-back on my 95 silverado and i love the sound. Its not really that loud inside. There is some resonance but not enough to annoy ya. and outside wow does it sounds good. not really loud but has that deep rumble on idle and acceleration is deep till bout 2300 rpms then it seems to quiet down for some reason. the american thunder has the 40 series in it but you can get the resonator that gets rid of the resonance.

remberto · June 23, 2003

just wondering if you have already visited Flowmaster's website(?) http://www.flowmastermufflers.com

seems they're entire media content is devised to answer questions like yours with downloadable sound samples of different makes/models and charts with interior/exterior sound levels.

i'm about to make a similiar decision based on my application (1500HD 4x4 6.0L CrewCab). i have duals meeting at the muffler (with seperate cats) and a single out from the muffler. i'm looking to change this configuration however it needs to be for best performance gains - any advice out there?

thanks in advance!

ridnlow · June 23, 2003

FLOWMASTER!!!! my friend had Borla's on a 2500hd 6.0l and he was very disappointed so he went with flowmaster and he loves it!

remberto · June 23, 2003

I'd take it as a grain of salt but this fella has some choice words to say against his decision on borla's exhaust.

From: http://128.83.80.200/taco/muffler.html

--

Borla bites! One of the few truck related purchases I wouldn't do over is the TRD exhaust. From that big, goofy tip just begging to be torn off (and spiteful enough to crunch the rear quarter panel in the process) to the weak, too-thin stainless on the muffler, it was a disappointment.

Jrrbuild · June 24, 2003

I have a Y2K Silverado with a 4800 LR4 engine with a Flowmaster 70 series single to dual muffer and I think that it has all the rumble I want with-out aftermaket headers (not yet) anyway! Just have the muffler shop cut off the old one and hear what the differances are in the 40,50,and 70 series then you'll know what you want to listen to every time you start your truck! VROOOOOOM

greyghost03 · June 24, 2003

I have the 40 series Flowmaster (3" in dual 2.5" rear exit w/3.5" tips) and it sounds awesome. There is in-cab resonance up to 60 - 65 mph but that does not bother me. I like it LOUD! After 65 mph there is little or no resonance in the cab. As far as sound outside the truck- AWESOME! I have also heard that if you run the pipes turning out behind the rear tires that will cut down some on the resonance. Depending on what type of driving you do the most, this might work for you.

Just my .02 Hope this helps!

ridnlow · June 24, 2003

My thoughts exactly greyghost..

remberto · June 25, 2003

i'm with you guys. i think it's going to be a flowmaster 70 series (i don't want to sound like i'm trying to hard while accelerating - what would the ford guys think!) will be a good fit for me. though the american thunders that 3500duramax mentioned sound great but i don't think they'll quite down at high RPM on my gas application (6.0L).

tps0424 · June 25, 2003

I've got a pair of the Flowmaster 40's on mine. 3" in and 2.5" out on each going to a pair of 3" tailpipes that exit at a 45 degree angle. I thought I was too old for something like this. Then I gave it a listen. Sounds great. Even with all of the rain we've been having in the Northeast, I drive with my window down.

I also tow a larger size camper with it and I ALWAYS get compliments of how good it sounds when under load. People love it. (Well not so much when I leave early in the AM but when I come in during the afternoon,

SportyShorty · June 25, 2003

Thanks for all the replys guys. I think I'm gonna get the 70 series. If it is to quiet then I can always swap it out for something different. I would rather have to quiet than to loud at first. Anyone know of any place to get them for cheap?? Also what size pipes do I need? 3" inlet and dual 2.5" exits??? Not to sure. Thanks again.

greyghost03 · June 25, 2003

Thanks for all the replys guys. I think I'm gonna get the 70 series. If it is to quiet then I can always swap it out for something different. I would rather have to quiet than to loud at first. Anyone know of any place to get them for cheap?? Also what size pipes do I need? 3" inlet and dual 2.5" exits??? Not to sure. Thanks again.

Sounds like a good idea to me! If the 70 is not loud enough, you can always swap it out for a 50, then to a 40. Just find what you're comfortable with. You can also see if anyone you know has any of the mufflers in question installed on their truck to see how they sound and how much resonance they have. I think the 3" in dual 2.5" out will work just fine for you.

BTW- I had mine done at the local Auto King muff shop. $260.00 for muff, pipes, tips and labor.

ridnlow · June 25, 2003

I know mine needed to be Dual in and Dual out.. but i just got single in and dual out and they had to make a pipe to fit it.. it is restricting air flow though

greyghost03 · June 26, 2003

I know mine needed to be Dual in and Dual out.. but i just got single in and dual out and they had to make a pipe to fit it.. it is restricting air flow though

I don't think it's very restrictive as long as they fabricated the y-pipe correctly. My truck has this setup stock- 2 cats into a y-pipe to the muffler.