Its time to upgrade my exhaust and ive decided to go with the flowmaster 80 series. I just dont know what one to get, I dont know what i need for mesurements on the inlets and outlets . Ive got a '91 rs with 305 tbi. I need to figure out wich of the 80 series i need. thank you!

 

Before you go nuts on a muffler, have you considered a full cat-back? Mufflers run about $100, but the cat-backs aren't that much more expensive.

I'd also check out a Hooker Aerochamber cat-back, or even just the muffler if you haven't considered them.

This is an American Thunder Cat-back on an L98. http://student.dpg.devry.edu/~d00712...owmaster80.wma

 

There is a sound clip of my 80 series in my sig. All stock except for 3" catback, with an 80 series muffler 3" in, 2.5 out.

 

man i wouldn't waste your money on a flowmaster anyway...they sounds nice on 4th gens and some 350 3rd gens but not on a 305. i had one and it sucked, performance and sound wise. after 1500 it was a loud drone sound. right now i have a glasspack on my car and it's really nice. but ya, try and find a full cat back that way u'll know that u have 3in all the way.

 

The whole cat-back system would be nice but i dont have much cash to spend on it. My stock muffler is all rusted out and i just want somthing to replace it and sound louder then stock. I doesnt need to be super loud, just have a better sound then it did. Would the 80 series or any other muffler do that for me?

 

well if $$ is tight for u right now, just buy a glasspack ($18), a 90 deg. elbow and some stright pipe. that's the cheapest and it's straight thru. then u can save up to buy a cat-back

 

A muffler wouldnt be a bad choice for your stock piping but it is best to replace all of it while you can.
If money is tight then you could just buy a muffler like flowmaster, aerochamber, spintech(more expensive), or whatever and have an exhaust shop fab up a catback system. I think it is cheaper this way than full catback kit from some company. my flowmaster from summit was like $330 and I have heard people getting true duals custom made for that much,so I can imagine that a single 2.5 or 3inch system using stock routing can't be all that much.

Just an idea, call around and find out. I don't know how much because I haven't done it but it may be cheaper. Flowmaster mufflers are like 80 bucks or so out of summit racing and you mean to tell me that the rest of the catback piping and tips are $250? It seems ridiculous cuz there wasn't much piping but I am happy with it.

Oh, yeah, they sound awesome on larger cubic inch motors or worked up motors. Don't think it will sound good on 305 tbi but haven't heard one. Good luck with whatever you choose.

 

I have a '91 L-98 with the american thunder 3" in and 3" out system and my cousin has a '92 305 TBI with the american thunder 2.5" in and 3.5" outlets and they sound nearly identical, but the L-98 sounds better.

 

i still think, y spend more than 50 bucks when u're gona want to get a new catback anyway...i'm still with the idea of a -20 buck cherry bomb. then save up for your cat back.

 

I just took off my rusty stock muffler and when i did i started up my car and expected it to be louder. To my surprise it wasnt louder at all. Maybe, just maybe a teeeny bit but nuthin like I expected. So if i go and put a flowmaster or aerochamber on it then will it sound better or is sumthin wrong with my cat?

 

When I had my american thunder catback for a month, it was only clamped on with the clamps in the kit (waiting to weld the seams). Well, I was driving and the muffler fell off right at the over the axle pipe. At idle it was about the same sound as the flowmaster muffler. So I took the rear section off and stuck it in the trunk and drove home. AS you accelerate above 1500 rpms till redline it screamed. Very LOUD. Big power increase. This was without headers and stock cat and stock L98 350.

A new muffler will tone the sound and quiet it up a bit depending on the muffler. A 80 series or aerochamber will be fairly loud at WOT but not so much at idle especially on a stock motor. I think both sound good.


Did you rev it abit or drive around without the muffler? It should have been louder by alot since straight pipe. If not I would say get a new cat but nothing super expensive. Just something new.

 

i just put a 40 series flowmaster on my 91 a few weeks ago. its not super loud but i think it sounds good. it looks kinda cool with only the one tail pipe out the back. it was 150 bucks for the muffler/new tailpipe/ and tip.

 

This is a joke right? Cuz the flowmaster 40 series on my 84z28 sounds real good. Its a 305 too. I have the 80 series on my 85Z28 with a 406 and it rocks. It was modified to a 3" in and 3" out instead of the 3 in 2.5 out. Talk about sweet.....:lala:

 

Im running 80 series and a high flow cat on a 305TBI and it sounds damn good. Im about tired of reading everyone bashing flowmaster everytime someone sees the damn brand. Ive heard almost all the mufflers you can get for our cars and flowmaster has a distinct sound either you like it or you dont. Quit telling people flowmaster will sound like sh*t on their 305s.

 

Preach it bro........

 

Everyone should listen to sound files and then decide on what they like best

 

Glasspack, straight pipes and cherry bombs????? I work part time for Checker and one of the asst. managers has a mercury cougar with straight pipes... . Guess he doesnt know what it will do to his exhaust valves. This is the same guy who bought a cheap caddy with a 502 in it just for the motor and took it to the track to see what it would run in the qtr. I guess I dont understand the mentality of all that. Mufflers are cheap enough to buy. I personally would never use the ghetto stuff (just my opinion). This managers cougar sounds ghey with the straight pipes. But he thinks its cool. I suppose times do change and anything goes now-a-days. I "hear" a lot of beefy vehicles around. Most of them are p'up trucks tho. I almost never look anymore cuz I figure its another truck passing by. And I never look at the fart cans going by unless I need a good laugh. I seem to have quite a few trucks rev on me at lights with their flowmasters tho. I just ignore them.

 

I'll chime in a little late here... I'm running the 80 series on my 305 tpi. I get comments all the time about how healthy my car sounds. As far as performance, I don't know how much I would attribute to the muffler itself, but I run with the stock l98 guys all day long. Sounds like your car needed a tune-up or maybe your cat was starting to plug. Bottom line, there is absolutely nothing wrong with the 80 series Flowmaster.

 

did I hear "sound files"?
stock manifolds, 3", flowmaster 80, dual 2.5" tail pipes on a 305TPI

 

ok, i'm not just putting them down bcuz everyone else does, i am bcuz i own one and had it on my car for over a year, then i opened one up. i'm sure that if i had my headers on without a cat then a 80 series, it would sound better, i mean i like them on 4th gens. but i still wouldn't put one on bcuz of the performance end of things. i never realized that it's all open inside and i can't imagine how the exhaust going in a box then out 2 different ends is good for performance. and i bet yours sounds sweet on a >>406<<...it has more exhaust flow. o well, here's a pic of the inside of one, all the yellow lines were where the baffles were.

 

Whats your point? You cut open a flowmaster and drew yellow lines like we dont know whats inside of them?

 

well LedZep, thank your for the better pic. but i'm sure there are a few people who don't know what's inside of them and how they work and looking at one it doesn't make sense that it's good for exhaust flow. the reason i cut open my flowmaster was to gut it out, and then welded it shut and put it back on. hell, it sounded 10x better and even tho it was an empty box, it still performed the same as the standard 80 series (crappy). i mean good lord, it seems like i'm the only one being "yelled" at for not liking flowmaster, hell i was all for em until i bought one....and i have a reason to not like it. geez

 

...

-Most people complain because of the restrictions in the muffler. If you removed them all and it still performed the same, it might not be the muffler

 

ya, when i had it on my car u could feel that it was restricting the flow, when i took my muffler off...omg it was like night and day. when i gutted out my FM it was the same but with a different sound, right after i gutted it, i got my headers on and took off the cat and drove it with just the gutted FM, when i took the gutted FM off, once again, it was like night and day. after i did my headers i ran out of money and couldn't get a cat or muffler, so someone gave my a glasspack (new too and free ) bcuz my car was too loud and now it sounds great and next to no perfomance lose with it.

 

The point of a muffler is to reduce noise so we dont get pulled over, its for emissions. If we wanted loud *** exhaust we'd run straights. :lala:

 

hey, my car has stright thru exhaust and it's not that loud at all. and i'm emissions exempt. so i'm not really worried.

 

I dont really understand the point you are trying to make here?

 

lol . how bout we just forget about it all. u might like FM i don't. o well. :lala: :lala: :lala: :lala:

 

4th gens sound good with flows cuz there engines can rev and make power to like 6000 rpm. At 5 grand my flows are wicked sounding, much like a mean kinda raspy muscle car sound. Never went above 5500. Must be awesome though.

It is the perfect sound for these cars in my opinion because they are muscle cars and sports cars at the same time. You know, an inbetween car with the looks and performance characteristics of both kinds of cars. Low, boxy, streamlined with some curves hinted and have great handling.

 

I like Flowmaster.

 

Yeah I have 30's on my car.

I don't know about performance changes, but they sound alright. They're real quiet up until about 1100 RPM then when I hit the gas they sound pretty mean.

 

hey i got jus a 80series muffler on my lil 305 tbi(atfirst)and it sounded good when i reved it with headers above 1500 and when i would be cruising at 3k then wash the gas.But now i did LT1 cam 216 heads ported and polished carbed too and its sounding mean as hell even at idle man when i rev it up youd swear id have to be a 350 or soemthing cuz its a mean lil 305.but none the less still a 305

 

Thats all it takes. More air from a bigger more built up engine makes a car real loud. As more mods come, the better the sound will be. I would love to hear it on a TPI 406 or bigger.