Has anyone had an aftermarket muffler on their 3.1L ?

[Geoff97Cutlass]

I was wondering which brand & how it sounded.

[BrianG]

I never had an aftermarket muffler on my 3.1 MPFI, but I did have the mufflers cut off and had twin Monza dual-out resonated tips put on. I liked the way it sounded. Not *too* loud either. Dunno if that helps.

[Euro]

I had an Advance Auto Parts special Dynomax on mine for a while. Was quiet, people had no idea it wasn't stock

 

It sounded awesome once it had developed a rust hole though

[94 olds vert]

Flowmasters sound good on a 3.1l.

[RobertISaar]

stock muffler(s) also sound awesome once they develop rust caused leakage.

[EGTGP]

all i have on my tgp is a high flow cat and resonator not very loud and sounds fantastic.

[tornado_735]

Brian (LuminaPower) has aftermarket mufflers on one of his many Luminas. He should be able to provide a video.

 

But yes, 3.1s (and 2.8s, and 3100s, and 3400s) sound glorious with cheap aftermarket mufflers. Shit, I had an 95 Grand Prix coupe with NO mufflers, and it sounded amazing. Droned something terrible though.

[Geoff97Cutlass]

I guess I should ask what diameter of exhaust pipe is being used too.

[94 olds vert]

2.25 inch pipe on 3.1 cars.

[LuminaPower92]

I have 2.5 Magnaflow Knockoff mufflers with a highflow Magnaflow Cat. Stainless Piping 2.5 the whole way.

[Hairdo12]

2.0 inch on 3.1 cars, not 2.25.

[LuminaPower92]

Mine have been 2 1/4 brah. until i changed em

[Euro]

Mine was 2.25 as well.

[Geoff97Cutlass]

This guy's car sounds nice:

My 97 only has single exhaust do you think that would alter the sound greatly?

[mra32]

MY 91 3.1 was less than 2" OD. It was close, but still less than. My summit welded chamber muffler sounded great. and it fit right in place. There is a video of an achieva with dual flowmasters. I think it sounds great:

 

[video=youtube;g8o16UHoW6A]

[RobertISaar]

FWIW: 95 MC 3100(single exhaust obviously), i have a 2" inlet cherry bomb glasspack in place of the original muffler, it slipped over the existing pipe and has quite a gap.

[ricklovin93]

I once had thrush turbo mufflers they were okay not bad for what I payed for them

[base93lumina]

On my 93 Lumina 3.1, i have2.5" piping from the down pipe all the way back to the y-pipe, its the stock size pipe from there into two Flowtech Raptors. It sounds pretty mean and i have had alot of compliments on it. Sounds mean and almost v8 throaty at idle, literally no rasp, and only drones from 1700-2100. I love how it sounds. Its 150 miles away right now or i would get a sound clip for you.

[19Cutlass94]

2.5" exhaust, dual, with Dynomax mufflers:

 

[redgrandprix]

i have 2 summit street strip mufflers on my car with a hollowed out cat and its as loud if not slightly louder than my dad 5.7 TPI trans am with a flowmaster 40 aftercat and headers