Okay so i bought my car with a flowmaster muffler and it was really quiet so i cut it off and i drove it like that with just a intermediate pipe. It sounded a little better but it was still quieter than a vaccum. When smog time came around i put on a dynomax catback, now i never know if my cars running or not...I'm thinking my cat might be clogged? If it is is there a way to get it to be deafining loud with a smog legal setup? I was thinking high flow cat and striaght pipes with no muffler.... Any suggestions?

BTW: Its the original cat at 190,000 miles...

 

Hey I am in the same boat as you man. I still have the origional factory exhaust my on my car form 1990.

I was thinking about doing a side exit exhaust with no muffler, which would be loud, but not real loud. If you want it real loud, you should get some emission legal headers and a high-flow cat. That will help alot. Also, if you build a motor with higher horsepower, the noise will come.

I will leave you a few clips to ponder for a little:

Here is my factory exhaust:
http://youtube.com/watch?v=7eavK1Xm070

Here is CaliChevyLover's car, with the exhaust cut off right after the cat:
http://youtube.com/watch?v=QEWatNdO8hc

 

It's weird to hear someone with a LO3 it's amazing how different mine sounds. Mine sounds like it's supercharged, it has a higher pitch whine to it.

Heres an old vid of my car with no muffler, just cat and intermediate. Don't worry this was the day i got my car, it's not disgusting anymore, its all restored now.

http://vids.myspace.com/index.cfm?fu...ideoID=4325259

 

i got a 3in full exhaust with a flowmaster 80 dual 3in exit and its loud as can be, im always making people , and i still got my factory manifolds on it (but have no cat)

http://vids.myspace.com/index.cfm?fu...deoID=26369651

http://vids.myspace.com/index.cfm?fu...deoID=28487107

both videos are with the windows up, there is plenty of more videos on the my other videos section, the only one outside video of the car is of my air horns and you cant hear the exhaust because of the horns and i was infront of the car and the open breather and power master alt wines like a super charger

(yes i own headers for it and have put headers on 3 other thirds, but for some reason im to lazy to do it again)

the factory cat will make a car QUIET as can be, as you said a vaccum cleaner is louder LOL, i would go with a high flow cat, and a set of headers to make it louder

http://vids.myspace.com/index.cfm?fu...deoID=28487039
^thats a video of me babying it through town^

 

Wow. Yours sounds amazing! Did you say that was with no muffler, or was that video with the dynomax, or the flowmaster? It still has the really quiet idle like mine, which is what I want to change the most.

Also, what kind of aircleaner do you have? That (or a vacuum leak) could be making the "blower" noise. Unless you have it procharged or something lol.

 

hey SLOW90 are you sure thats a stock muffler???

my stocker wasnt that loud lol (then again i cant rember that far back)

 

Yeah, its definately stock (bought it from an old lady, car was parked for years i think)



You cant see in the picture, but I think on the bottom of the muffler, it says something like "GM #########" i dont know what numbers they are tho.

 

LOL crazy, i just as far as i can remember my stocker and a friends stocker were quiet...... but stranger things have happened

but the 82 Z28 with stock dual mufflers is not real quiet, but the cat was removed, it was quiter with the cat also

 

my cat might be blown out, you never know. I hope it is!

 

Might sound mean but buy another muffler. Here is my '90 305 TBI with an idle video, WOT in car, and a couple of throttle stomps. he muffler is a Flo-Pro and the tips are some generic rectangle ones--which I might sell when I put on my LT1 tips. Keep in mind the engine is stock w/241,750 miles in that video.

http://www.youtube.com/watch?v=6ChaymY18so
http://www.youtube.com/watch?v=-GzgsLZhD3g
http://www.youtube.com/watch?v=db8Qbc8VZGE

God I love the sound of my car.