LS1 Sounds

iTrader: (11)

I bought this exhaust used from a guy last summer and never really paid much attention to it after the install. Now that it's getting cold outside, I'm noticing that no white smoke comes out of the driver's side tailpipe AT ALL on a cold start. I checked inside the tips and the pass. side is black but the driver's side is clean as a whistle.

I tried to dig into the tailpipe with a coat hanger to see if something was blocking it, but the coat hanger wasn't long enough to reach past the bend into the muffler. I couldn't see anything with a flashlight either...

There were some leaves and stuff in both tailpipes that were blown out right after we installed it. I'm thinking something might be in the muffler (either more leaves or a rat or something) blocking flow out of the driver's tailpipe. How could I check this and clear it out?

DaddySS

I believe I remember reading about a restrictor in the left side, take it to a muffler shop and have cut the pipe just outside the muffler, rmove the restrictor and weld it back together. Shouldn't costtoo much and will be worth the peace of mind.

n2oblkz

iTrader: (1)

Yep, I would say that you have what they call the "cone of silence." Do a search with that phrase and you will come up with a couple of good articles, one even has a picture of the cone after it has been removed, It is reduced down to about 1/2" ont he drivers side tailpipe. They say that the test that you need to do is straighten a coat hanger and run it up both tailpipes. It will go all the way in on the passenger but will get stopped on the drivers side. I bought a Dual/Dual from a guy that has a 2002 Firehawk and I did the hanger test and mine stopped the hanger on the drivers side. I am planning on taking it to a guy I know that does exhaust work to have it removed but I just haven't had time yet. Keep us posted on what you find out if you do it.

n2oblkz

iTrader: (1)

Here are the links for you.

https://ls1tech.com/forums/showthrea...one+of+silence


https://ls1tech.com/forums/showthrea...one+of+silence

Flawless

Wow, I always knew there was something wrong when one side of my D/D would have more smoke coming out than the other.

Beast96Z

iTrader: (21)

There is a restrictor, but the exaust was designed to work that way. If you remove the restrictor, most of the gas will then divert to the drivers side and you'll have the same problem, just oppisite sides. The D/D is one of the best catbacks out the way it is, so I wouldn't mess with it to much.

n2oblkz

iTrader: (1)

From what I understand, SLP only put the restrictor on the factory optioned cars with their exhaust for noise control. The Dual/Dual kits that you purchase direct from them from what I hear are louder than the kits put on the SS and Firehawk cars. From the articles I have read, the cars sound better with the restrictor removed. I think I am going to take a chance and have mine removed.

Beast96Z

iTrader: (21)

Supposedlly this was only on the 96-97 SS's with the SLP 2 on the left exaust. All the D/D's are quiet and should be the same.

n2oblkz

iTrader: (1)

Check out the two links I posted above, I can't imagine that SLP would reduce one pipe down to only a 1/2 inch for any rason other than noise control. I don't know, without seeing the inside of the muffler, it's hard to tell what the path looks like. But I would imagine that since the restrictor is on the drivers side, it should be a straight through design on the back of the muffler going from the 3" inlet to the drivers side 2.5" outlet, where the ruducer is at. We'll find out, I am going to take my digital and document what is going on and let everyone know, if mine indeed has the "cone of silence."

LS1 Sounds

iTrader: (11)

I knew about the cone of silence on the 2otl kits but wasn't aware that they were also on some DDs! I will check into it after I install my LT headers, but this is probably what my problem is. Thanks for the info! I will keep you guys posted as to what I find! Unfortunately, I bought this kit used and don't know if it was from a factory-optioned car or the aftermarket.

n2oblkz

iTrader: (1)

If the tailpipes are welded together when you got the exhaust, more than likely it was off of a factory optioned car.

LS1 Sounds

iTrader: (11)

They were... I'm betting I have the cone in there too.

smokin' joe 00 ss

There is no cone in my 2000 SLP SS Dual/Dual, I wound why some would have it and some don't.

69_YENKO

iTrader: (16)

my 2000 SS with factory optioned DD exhaust didnt have the cone in it either. I made sure to look when i cut it apart to box up & sell

Beast96Z

iTrader: (21)

It's not a cone. It's just a flat piece of steel with a 1/2 inch hole in the center. It is about 1" outside the muffler on the Drivers side tail pipe.

69_YENKO

iTrader: (16)

Either way mine didnt have it in there.

Ryan02SS

iTrader: (3)

My 2002 CME setup which utilizes the Dual Dual muffler did not have the cone. FYI

LS1 Sounds

iTrader: (11)

No new updates on my Cone of Silence situation, but I did add the information to www.ls1sounds.com for both the dual-dual and 2otl kits.

n2oblkz

iTrader: (1)

Cool, keep us posted, winter has already hit here and they have already salted the roads so it looks like it will be spring before I get to mine.