bout-time

So my '92 came with true dual exhaust with no converters and Flowmaster Original 40 series mufflers. It sounds great at idle but is almost un-driveable at speed. It has a terrible interior drone (imagine that). I am hoping to replace just the mufflers and quiet it down a bit.

Is anyone running an exhaust system with no cats? What mufflers?

Thanks!

don hall

Is smog an issue in MD?

hogsnvettes

My '95 has a completely stock exhaust except mufflers. When I bought it several years ago, the previous owner had installed Flowmaster 40's but had gutted the inside. Still don't know how that was accomplished. Picture boat in a bottle then trying the get the boat back out. Anyway, when I picked the car up, I got on the Interstate and thought, OMG what have I done! The drone was so loud at 70mph I couldn't hear myself think. Within a few days I had a local shop put on a set of Walker mufflers very close to stock. I don't wake up or scare anyone, but cruising down the highway is now something I enjoy. It's almost too quiet. It's so quiet I think I'll put on a set of Stainless works headers.

bout-time

We do have emissions testing, but the Vette is 20 years old this year, so I got Historic tags. No emissions testing for Historic cars.

don hall

Good news! I'm sure you have read the Corsa comments ..... nice note, no drone, etc.

My only C4 experience was with the stock mufflers replaced by MagnaFlows. My Mags got louder over a few months to the point of displeasure.

With forum help, you will find the perfect system.

bout-time

Well, I was considering MagnaFlows, until I started reading about the hanger ripping off the top of the mufflers.

I heard the Corsa's at Carlisle, they seem a bit to raspy and European to me.

I did run a set of Dynamax mufflers on a car years ago, but they seemed a little too quiet.

weaselbeak

http://youtu.be/rd_LQFx0-JI

I can't tell you about the sound at 75 yet because it's not been there-I'm down to two gears.

http://youtu.be/EqOylswBpuk
These are like a targa or kbd muffler.
That's the idle though.

blackozvet

I put supertrapps on my 85 (gutted cat) I had the dreaded drone after engine mods, drone instantly gone, sound is better too, supertrapps are adjustable for noise and power.

Alan777

Corsa's are only raspy if you don't have cats and/or you've got headers. The corsa cat back by itself sounds great.

92ragtop

I've got Dynamax, no resonators and true duals on mine. Sound is nice - not too quiet, but still barks at WOT.

GREGGPENN

Why would you want to? Is this a track car or 500hp build? If not, cats don't hurt, in fact help, and will do alot for your drone.

If I had an LT with your issue, I'd look into reinstalling dual cats. Probably something like these....
http://www.car-sound.com/02product/u...IC%20CONVERTER


I think it's "bout-time" you got some cats back on that thing!" LOL

LT1_BlackC4

My '94s exhaust is almost completely bone stock. Cats and resonator still in place, but I just had a set of muffler eliminators installed. Sounds great and the drone is there, but not unbearable.

Yorcci

I've got a '91 with true duals and Hedman LT headers. I've had stock L-98 mufflers and now LT-1 mufflers without cat. BOTH are drone-free. LT-1's rectangular tips look better to my eye, so they are still there. Although I made ca. 10 kW more power with stock L-98 mufflers at dyno...

pros&cons

bout-time

Well I got the car without cats. I could purchase some nice aftermarket cats, but they aren't cheap. I was thinking of just swapping out the mufflers to solve the "drone" issue. Flowmasters sound nice at idle and have nice polished LT1 tips, but have alot of drone at cruise speeds.

GREGGPENN

IMO, aftermarket performance cats are less expensive than these brand-name performance mufflers.

For a stock LT car, ceramic Magnaflow bullet cats could be added for about $140/pair + installation. How close can you get to that with mufflers like: Borla, Corsa, Magnaflow, Flowmaster, etc....

Plus, it would smell better.

Fredbird

Really? Too Loud? Is that even possible? I like mine so loud I wake up my friends south of the border!

bout-time

Interesting. Maybe I could add the cats and keep the Flowmasters and it would be bearable.

You are so right about the smell!

jmgtp

I'm not sure just how common the hanger issue is on the mangnaflows. They've been on my car for 3 years issue free. The welds on the hangers look solid.

I removed the resonator to make it louder. The Magnaflow system with resonator (I do also run factory cats) is fairly tame. Removing the resonator did add some volume but it mostly made it sound more aggressive, which is what I wanted. It added some drone, but I have 4.11s which I think help greatly in keeping it out of the drone zone on the highway. Despite the added resonance I'm happy with it. If it was a daily driver I would have left it with the resonator though.