yes guys, what could be the best muffler for my stock 305? keeping in mind that everything else is stock, and a tight budget.
i would like it to sound deep grave.
as info the muffler i'm replacing is from the old V-6 system.

 

I'd say get a 2 chamber flowmaster. They sound pretty good on 305s.

 

I agree....that was my first mod. They are not too loud on the inside but you can really turn heads on the outside when you open it up.

 

how about borla? my '89 irocz will need a muffler soon too.

 

Flowmaster with 2.5 " inlet and 2.5 outlets.Sounds great and you will notice a little improvment in power.....bob

 

I changed my 87 IROC from the stock ugly-*** dual tip to a dynomax single in single out 3 inch....looks bad *** and is very deep and throaty......but everyone compares them to flow master for a reason, I've just noticed that the flow master's that i have on my truck look about rusted out and my dynomax is older and in better shape.....

 

If you're on a budget, the dynomax "replacement" muffler #17739 at $45 is hard to beat. It's got a little better sound than stock (2.5"in dual 2.5 out)and flows more than enough for most aplications,, for sure enough flow for a stock 305 or mild 350. I've got one (practiaclly new when I bought the car),, and I'm in no hurry to replace it.

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86 IROC - 9.8:1 - 355, TFS twisted wedge heads, 218/228-110, fully ported GM base and plenum, SLP runners, 52mm BBK, 24# SVO, 1 5/8" Headman headers, 2.5" Dynomax, TH350, 2200 stall, B&M Megashifter, 3.23 peg leg, 245/45ZR17s on 212 Eagles

 

would you say that flowmaster is loudest? if it is, thats probably what ill get. i want to bolt flowmasters to headers and then run that to a single pipe out to the back. ive heard fm's on a mustang, but i dont think ive heard any of the others. loud?

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beau-t-ful yellow 85 iroc

 

ok guys, flowmaster it is but any part numbers? thanks.
fernando.

 

get the hooker aerochamber muffler!!!! Sounds way better than any flowmaster I've ever heard.

 

How about SPintech how do they compare to flowmaster? I've heard they are loud as hell Anyone have any experience with these mufflers?

 

I have the 80 series with 2.5 inch turndown tailpipes. It's not really that loud at all, the turndowns may have something to do with that. I have a 305 too so it may be louder on a 350. I'm getting a Hooker Aerochamber Cat-Back soon and maybe you should look into one too.

 

I'd stay away from Flowmaster if you care about performance. I haven't seen them do to well against some of the other brands mentioned.

 

Flowmaster would definitely be your best bet and it won't sound like your typical five-oh. I was impressed by my friend's LB9 with just a flowmaster and he's gotten compliments about it from everybody. You can check out the whole line at www.flowmastermufflers.com but I can tell you the direct replacement will be an 80 series. When I get the money, I'm going to get one too. Its not worth it to go overboard for headers and a full cat back system when the future might may hold a 350. You'll probably be looking at about 100 bucks for the muffler, then you'll need tips and labor unless you do it yourself. Good luck.

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"The world would have no problems if everyone had a presence of mind."
'91 Firebird
305/TBI(L03)/700R4/T-tops
Mods: Catco high flow cat - B&M Shift kit - TA tail light conversion - K&N - White faced guages on the way
Stereo: Pioneer DEH-P8200R - Pioneer 6x9's - Kenwood 8" Tube
'87 Firebird
LB8/700R4/220K - Twas a good car until the accident.
Firebird parts - Now with an '80 Firebird for sale!

 

I'm getting a Hooker Aerochamber as soon as i get the money. It sounds really good.