Leave your stock mufflers -WHY!

[SRFnSNO]

I have Dynatech Cats on the AV.
Dynatech-Long tube headers (Jet coated) & Free flow cats.
Tied into a magnaflow Large body exhauts sized up to Dule 4" at exit.

All 306 S.S. from Block to end. Am running Magnsun, KnN, & HP Tuners.....
The only issue I hsave had is the LT headers throwing O2 codes HP Fixed that.

On 5.3L LS moter!

[Edrock]

Originally Posted by GREAT PUMPKIN

I know that many of you on this thread are wanting to hear the GMPP exhaust but just in case anyone is interested in the direction that I have decided to go I just ordered some 40 series Flowmasters and will repost a video when I get those installed, but for now this is what it sounds like without the Resonators or the rear catalytics. I kept the Front Catalytics due to the O2 sensors and have not had any problems. I would like to get some High Flow Catalytics, Does anyone have any advice on which company makes the best High Flow Catalytic????

You raise an interesting question. Since this car has 2 sets of CATs, would it still pass inspection if the rear set was removed leaving the front set hooked to the O2 sensors?

Also, Did the sound inside the cabin increase when you deleted the resonators??

[jojohn33]

Do I remeber correctly in that get G8 is the same way only worse because it had some kind of "stuffing inside to make it even less loud?

[GREAT PUMPKIN]

Originally Posted by Edrock

You raise an interesting question. Since this car has 2 sets of CATs, would it still pass inspection if the rear set was removed leaving the front set hooked to the O2 sensors?

Also, Did the sound inside the cabin increase when you deleted the resonators??

The place that did my exhaust is also a N.C. inspection site and as far as they could tell while I was there, it still will pass the inspection.

The increase in sound is more noticable outsie the car, but I can tell a difference in the car if I am giving it a little extra throttle. The few people who have heard it were able to tell there was a difference, but I think that I would be happier with a nice set of High Flow Cats.

[hot ss]

Originally Posted by ADM PERFORMANCE

I wanted to bring attention to all .....The factory muffler is a straight through design as I have found on every SS vehicle(TRAILBLAZER SS,CAMAROSS,HHRSS) I have ever worked on.


So why change your exhaust,how are guys claiming power differences by replacing them,,both good and bad...Please explain!

Just an observation -

show us a pic of the other third of the can that we cannot see.

[oxidizr]

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

[SGOS252382]

Originally Posted by oxidizr

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

What the heck is going on with that?

I can't wait for my GMPP off road axle back to show up. Thats some crazy looking stuff going on with that muffler on the L99.

[Verio]

And thats why my car sounds like a wimp :(

[okie2]

Originally Posted by SGOS252382

What the heck is going on with that?

I can't wait for my GMPP off road axle back to show up. Thats some crazy looking stuff going on with that muffler on the L99.

SGOS, are you going to try and post video/sound? The one posted on the "exhaust" link doesn't specify which GMPP version it is.

[rpepka]

Originally Posted by oxidizr

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

Looks like something from the twilite zone

[bgbadss]

Originally Posted by FISHTAIL

Just want the V6 to sound more like the V8. I want that deeper note throughout the acceleration range, even at the higher rpms where it starts to sound a bit like a ricer.

Don't tell me to get the V8, that's not going to happen!

Ain't happening unless you add 2 more cylinders.

[bgbadss]

Originally Posted by camaro5

They absolutely increase backpressure. They minimize it, but cannot eliminate it.







The L99 with AFM active sounds - hmm - not so good, running on 4 cylinders.

They HAVE to keep it quiet, and rather than give the LS3 better exhaust, they both get the quiet version.


.

Boy, are you right about that. My buddy put a axleback on his L99 and it sounds great until the 4 cyl thing happens under no load. Then it just sounds fugly as hell. Has anyone been able to tune this thing out? :(

[Mzodarg]

FWIW- I had my J-cans removed yesterday, tips rewelded all for $60. This was done on a 2SS A6. One thing I noticed when the car was in the air was that it appears to have a muffler or another CAT just past the transmission. It looks as though is very restrictive as it has some sort of cross member a crossed it and the muffler/cat is reduced significantly in order for the cross member to pass over it.

First impression of the trashcan delete is favorable, slight drone in car, but tolerable. Seems to have a noticeable low end torque increase, certainly does not sound like my muffler fell off and honestly I did not notice the AFM activating via sound change- may be audible outside the car-but who cares- Boston Aucustic (sp) takes care of that.

Just my experience and for now this is what I am sticking with until the aftermarket can say POP. No way I am paying the prices that are being demanded for the current offerings.

Regards,
Mike

[thebrainhart]

Originally Posted by Mzodarg

FWIW- I had my J-cans removed yesterday, tips rewelded all for $60. This was done on a 2SS A6. One thing I noticed when the car was in the air was that it appears to have a muffler or another CAT just past the transmission. It looks as though is very restrictive as it has some sort of cross member a crossed it and the muffler/cat is reduced significantly in order for the cross member to pass over it.

First impression of the trashcan delete is favorable, slight drone in car, but tolerable. Seems to have a noticeable low end torque increase, certainly does not sound like my muffler fell off and honestly I did not notice the AFM activating via sound change.

I agree, I had my mufflers chopped off yesterday, straight piped, with nice tips, left the resonator and all 4 cats. Course I do also have Doug Thorley shorties too.

It has almost an exotic V8 (ie ferrari, lambo V8) tone to it while driving at times. Sounds pretty cool. Louder than stock, of course, but isnt too loud, I think it sounds good. Startup and idle is cool too.

Even in V4 mode, I dont mind it. Wierdest part is when it switches from V8 to V4, and back to V8, it has a moment of wierd sound. But it is definately livable.

Here is a quick video of it, cut short, as my phone died while filming: