LQ1's high RPM exaust warble fix?

[Stevo]

I have a stock 93' Cutlass Supreme LQ1 exaust except for a pair of Flowmaster 40's. Chosen because I got em cheap and one stock muffler fell off ... lol

 

I do notice a high gargling sound which I understand is standard for the LQ1's setup. Any way I can change the exaust note under higher RPM's to not hit a high warble. Any suggestions from the Cat back? Maybe a resonator? Links?

 

Come on you W-philes, I know there is an exaust pro somewhere around here.

[slick]

IMO, the Flowmasters don't sound good on the 3.4's at all.

 

As for quieting it down even more, well, there is already a resonator stock. But, I guess if you desire to have it quieter, you could toss another glasspack/resonator inline.

[Stevo]

This is gonna sound dumb but what the hell.

 

What if the exit pipes on the flo's are restricted? Can I sound deaden the mufflers? Is there even enough room to pack another resonator in?

 

Can I nail my hand to my forehead in a permanent finger L shape configuration?

 

Anyhoo ... at idle I love the exaust. It's the high RPM gargle I hate.

 

Would'nt a glasspack eventually blow through?

[slick]

Well... with a glasspack added onto your current exhaust(before the y-pipe), it will help, but not until the glasspack has broken in. After a while, it will quiet down even more. Idle should still sound the same, except maybe a bit more quieter, or even deeper. It will really quiet it down in the middle and upper range though.

[Stevo]

interesting ... very interesting.

 

muahahahaha.

 

What about pipe diameter? Any suggestions?

[slick]

If you plan on keeping the stock exhaust tubing, then just get a glasspack that has the same diameter(2.25" IIRC).

 

If you plan on upgrading all of your exhaust, your downpipe is already 2.5", so from the downpipe back, make it 2.5". Be sure to replace the cat, as it does help quiet down the 3.4, and the glasspack/resonator helps a lot also. I know the 40 series mufflers are quite a bit louder than most stock vehicles, so your always gonna have some extra noise you don't want. If you want to get rid of them, I suggest Borla or Magnaflow.

[Stevo]

Thanks.

[GOT2B GM]

I have Magnaflows on my Z34 and they are LOUD. And that is with a resonator. If your that concerned about sound, just put stock style mufflers on it with a resonator.

[slick]

I had magnaflows with a high flow cat and a resonator, and it was decently quiet(well, quieter than a lot of vehicles I have been in). You could always go with a longer glasspack.

[GOT2B GM]

As a rule of thumb, anything that is straight through in design, is going to be fairly loud.

[slick]

As a rule of thumb, anything that is straight through in design, is going to be fairly loud.

 

The length of the glasspack does determine the loudness though.

[GOT2B GM]

Yes I agree.

[Stevo]

The resonator is pretty long ... I can't see how anyone can stuff a glasspack in there. The Flowmasters are brandnew. I bought them from a guy and they were still in the boxes.

[slick]

The resonator is pretty long ... I can't see how anyone can stuff a glasspack in there. The Flowmasters are brandnew. I bought them from a guy and they were still in the boxes.

 

Take out the stock resonator and add a longer glasspack.

 

How much use is on the Flowmasters now that they are on your car? Usually exhausts will quiet down after some mileage and use.

 

If it's still too much, I'd really consider switching to like a 50 or 60 series. Should be a bit more quiet. Or, bite the bullet and go from some magnaflows.

[Stevo]

Yeah I'd like to change them but unfortunately I can't due to cost.

 

The Flowmasters are just shells with walls for baffles. No batting to add additional sound deadening.

 

 

Would'nt a glass-pack eventually blow through to the point where it's a straight pipe?

[slick]

Yeah I'd like to change them but unfortunately I can't due to cost.

 

The Flowmasters are just shells with walls for baffles. No batting to add additional sound deadening.

 

 

Would'nt a glass-pack eventually blow through to the point where it's a straight pipe?

 

After years of use, yes. But, after a bit of use, the glasspack actually quiets down a bit.

 

The stock resonator may just be toasted. See if you can find another resonator to put in place of the stock one.

[Stevo]

Well you may just be bang on... considering the muffler's were shot and there is a large amount of surface corrosion on the resonator despite some integrity testing (banging with a hammer). The internal baffles maybe screwed.