first its a 4 cylinder...second its when GM was having money problems so this car is made out of very cheap/thin sheet metal.

you can try putting on a bigger resonator which will help quiet down the drone BUT it wont eliminate it.
The 2.2 and 2.4 are Naturally Aspirated (NA) engines, therefore any modification to the air intake/exhaust system will make it drone.

Also, you just installed it, it will take some time for the exhaust to "break" in and it will get a bit quieter, but not much

 

I agree, as you run it a few days it will settle in, re tighten the clamps and flange bolts.
Or take it off sell it and order the Walker cat back much quieter!

 

I also recommend not driving hard for a bit, let it settle in or you might blow gaskets and bolts etc

you could also try putting on the stock air intake to see if that changes drone at all...probably wont, but worth a try

 

So...

Resetting the computer?
Letting it settle in and then retorquing?

And then it should be better.

If not, I have to try and sell it.


You don't think Borla would back it up since they specifically designed it for my car with the GM approval to not have drone, according to there site.

I see they don't guarantee sound like other manufacturers, but they could at least guarantee no drone on a $881.00 retail exhaust system???

P.S.
Walker is the same company as Dynomax, just a different line, and the system you have uses a muffler with chambers and different sections.

The reason I went with the super turbo from dynomax originally is because I have used it on multiple other cars, with no drone and a slight mellow increase in tone above stock, on every other car I have tried. Also, it is still like a straight through design, it just whipped around like an S inside the muffler.

It's just sad, I usually spend under $100 on a new muffler and the car has great performance and an awesome sound.

 

Keeping it under 2500 rpms it's perfect. Above 4000 rpms the car is moving with engine roaring no drone.

Go up a hill or have the car start moving from a stop, or try to keep a speed limit with the rpm constantly under load in the 3000-4000 rpm range and there is the unwanted drone.

 

Well this has been my day one freak out. Thanks for your input, I will let you know how things go after a week. :)
Hopefully good news in the future. :)

 

Have you tried the baloney slice muffler tip? That helped with some problems back in my straight pipe phase.

 

Your talking about a tip that has an angled cut.

Hmm, how did that help?

 

It decreased the popping on straight pipes might help with your drone too.

If you would rapp your exhaust with straight pipes you could actually break windows so cutting the pipe at about 60 degrees would reduce that.

You could try a bolt on extension.

 

The Borla has a tip welded on.
You could call or email Borla and discuss your options.