85Iroc-Z

iTrader: (4)

I searched and still had a couple of questions about the 80 series. How much power can be expected by swapping on an 80 series over a factory muffler? How much louder is the 80 series than stock (idle to WOT). And for everybody out there that has one, what do you like about them and what dont you like about them?

blackandgoldl69

I don't know about power gain but the sound is awsome when i fire mine up it goes loud enough to get people to turn around and look to see what it was the smoothes out to a nicely toned idle wot isnt super loud if you listen to music alot i wouldnt suggest this muffler unless you have a good system because you wont hear your radio very good. by the way i have all stock exhaust except the flowmaster.

IROCThe5.7L

I had one with stock exhaust, then with headers. Nice idle, pretty loud, nice bass to it. Driving around normal it sounded good too. But anything over 3000 RPM in my opinion sounded great. It had a real growl to it and was pretty loud.


Of course, after more exhaust mods like a High flow cat, 3" pipeing, and headers, it gets louder.

85Iroc-Z

iTrader: (4)

Anybody know how much better these mufflers flow than stock or compared to other aftermarket mufflers? I have heard that the flowmasters are poor flowing mufflers but I dont really believe that they can be that bad.

cityspud117

maybe 2 hp....what do you have done to your car now?? most of your sound will come with modifications to the motor...everyone has a diff opinion about flowmaster...i prefer hooker aero chamber..a bit quiet (unless your motor is built up) then it sounds great...again just my opinion...hope it helps



mike

85Iroc-Z

iTrader: (4)

I have a cam and plan on putting headers on it soon.

Rayzor32

iTrader: (1)

i think mine sounds pretty crappy, but it also has a small hole in it, poppy and crappy but once it hits exactly 3000 rpms (maybe cos of my stall) thats just the "magic zone" it immediatley opens open and roars

cityspud117

cam and headers will deffinetly help the sound the flowmaster makes...sometimes you can check out youtube and find exhaust clips similar to what you want and see if you like the sound...to me flowmaster is on everyones car and sounds like a tin can...to each his own tho...hope that helps at all...



Mike

CamaroLover09

Just got my 80 series about 5 hours ago and I gotta say I like it. It sounds magical till around 3000 rpm but then it kinda craps out as far as tone goes. Kinda sounds like my bro's k5 with open pipes. I'm hoping it gets better after I break it in. It's definitely louder than stock but not too loud for me. Even with cheapo pepboys speakers it doesn't drown out my stereo and that was with the t-tops off. Overall, I'm happy with it.

dekoy411

I have an 80s flowmaster in my 92 camaro. When I had the 305 engine in I thought it did sound nicer over the stock muffler. After I put my 383 in it just sounded that much better. Over all I'm quite satisfied with it I love the sound of it cruising and even more so at WOT. I've heard people call Flowmasters Blowmasters but from my experience they're great mufflers. To each their own I suppose...

keeslinger31

I took my 80 series off and replaced it with a hooker aerochamber my car is quieter and faster now... how bout them apples.

IROCThe5.7L

What were your Dyno numbers after the muffler swap?

keeslinger31

my butt dyno is all
Edit: you sound doubtful have you seen flow rates on the flowmaster crossflow
?

IROCThe5.7L

Ohhh, ok.

Very simple. If you have a healthy decent HP engine, and let's say you switch from a cross muffler like an 80 series to a straight through muffler, I agree you'll see a gain for sure. If you have a L03, LB9, L98 that's stock or close to it, your lucky if you'll see a few HP difference. That's why I always tell people get what YOU think sounds the best.

keeslinger31

Im not bashing flowmaster i liked the sytem i had but it was 2.5 inch i pipe and 2.25 tailpipes and it was really old and almost rusted through. so i replaced it. And it feels a little faster.

IROCThe5.7L

I loved my 80 series. I recently switched mufflers though, time for a change and I wanted a little louder.

Cody Ashby

iTrader: (2)

When i got my exhaust done on my 1991 Formula (305) I ordered the 80 series flowmaster muffler..high flo cat..and 22" Long 3.5" diameter tips..And when the exhaust was getting put on they called me out to the shop when they had the muffler and highflow cat on and we started it up to listen and i wasnt all that impressed cuz i wanted it to be loud..Well 20 minutes later they welded on my big tips..and OMG!! It was alot louder..Big diameter tips will actually make your exhaust deeper, louder, and throatier!! So to answer your question..ya the flowmaster muffler has a great sound to it..And i could tell a difference in performance as well!

Curtisyz54

iTrader: (5)

ok what the hell??

I JUST Put a 80's series on my 86 iroc with stock 305 and stock exhaust, and its QUIET!! like not even loud, at all, I really cant notice a difference as far as sound goes from the stock one. Kinda disappointed. But gives it some performance.

Darkshot

iTrader: (4)

Give it a couple months. It will get louder.

IROCThe5.7L

There's your problem. Get a high flow cat, and 3" pipeing. That along with some break in time for the muffler and it will be louder.

Curtisyz54

iTrader: (5)

Im cutting the cat off. It actuly has 3" piping on it right now.

IROCThe5.7L

Do you have a TBI or TPI engine? I had an 80 series with stock exhaust. And it was much louder than stock. After headers and a 3" exhaust it was even louder.

Curtisyz54

iTrader: (5)

I have a TPI. And like it is not loud, Idk maybe im just use to loud cars? my dad has a full built 340 Duster, and its loud, I dont consider this loud. It has 3" pipes from the cat back, then 2,5" outlets, Stock manifold, all that. Its NOT loud lol. Maybe just need to get rid of the old rusted out cat.

Rayzor32

iTrader: (1)

mine has to come off it sounds like a tin can, gonna go duals with some cherry bombs dumped at the rear

lownslow

I felt the same way as you did, though I got the 40 series in my 86 305 TBI.

My dad's stock ram charger has a very nice sound just when he presses the gas and I wanted something similar for my camaro. I was kind of down the first day I had the flowmasters, but since I've been driving it more often it's getting that deep tone that I'm looking for.

I would say to definitely let it take its time to break in. A few peel-outs here and there wouldn't hurt either.

five7kid

iTrader: (14)

You must not have read my thread on the topic.

I don't miss mine at all. In fact, I'd like to have the garage space that it is currently taking up. If you really want one, I'll make you a deal. 3" inlet, dual 2-1/2" outlet. Comes with tailpipes if you like.

I still don't get this "break in" thing. Mine sounded the same from the day I put it on the hopped-up 305 to the day I took it off of the current 350.

IROCThe5.7L

I just put a powerstick muffler on my car. I noticed a change in sound when the muffler started to build up soot inside. Nothing huge, but noticeable.

five7kid

iTrader: (14)

I keep hearing it about Flowmasters.

Maybe I just don't produce enough soot. . .

MrBrooks

If you are building up "soot" to the extent that it changes the sound of ANY muffler, you need a tune done by somebody that knows what they are doing in a BAD kinda way!!!!!!!!!!!!!
And of of you all wonder why you can't pass a sniffer????????????

IROCThe5.7L

Take the exhaust of any car, and it is not going to be clean inside. Most likely, it will be black. That's what the inside of a muffler will look like to. My cars tune if fine. It has also been datalogged, not rich or lean. As I stated above, it was a slight change. I can't speak from experience about the 80 series changing sound. Many members say they do, can they all be crazy?


Gut your cat. You will get plenty of soot and like 20hp, I swear...

drknow90rs_ss@y

iTrader: (3)

I like the sound of my 40 series, myself. I've had the 80 series before and found it to be too quiet. Thats just my taste, though. I also added a 3" magnaflow cat and three inch pipe all the way back. (That made it even louder).

Rayzor32

iTrader: (1)

just ditched the flowmaster and went with magnaflow. Not near as loud but man so much better sounding and no drone

96v6bird

I had an 80 series on my V6 (my '96 firebird)and it wasnt loud in the cab, But if you was outside of the car and somebody else was driving its alot louder and more noticible.

I think it just seems quiet since your inside the car and the pipes are going out the back, I KNOW you guys V8's have gotta be louder then my lil V6.