Magnaflow removed, Flowmaster installed..

[urr2slo]

Originally Posted by harrington81

That's funny I put the Magnaflow #16483 on my 2010 LS3 and it is way to quite with stock manifolds and cats. I to should of went with American Thunder or Borla ATAK. Kinda a waste of $1000 for just a bit louder then stock. Oh well longtubes someday.

I have the same system and with the Dynatech lt's it sounds perfect.

[Inferno LSX]

This is funny because I went the other way. I loved the Flowmasters, I even delt with the drone sound on the freeway. On the dyno, it's another story the Flowmasters held me back with my Whipple build and now I went with Magnaflows. The Flowmasters were getting so hot the paint was burning off. The Magnaflows are quiet at idle and part throttle and no freeway drone. You have to be the throttle to hear them. The best part about them was I "could" put my arm through them. Straight through design.

[usmcjlp]

I hate to tell you but mufflers do nothing for performance. All it does is attract attention. I'm at over 650+ rwhp. I currently have 4 mufflers and a set of helmholtz pipes installed. I also have 4.11 gears installed.

I can't quiet this thing enough. In Virginia, we have a show of speed ticket, which is not good. They are anal about exhaust noise. I just wish this thing didn't attract so much attention from law enforcement.

Do yourself a favor, if you intend to drive this thing hard, get the quietest exhaust possible. If all you care about is showing off, well then....

[Inferno LSX]

Originally Posted by usmcjlp

I hate to tell you but mufflers do nothing for performance. All it does is attract attention. I'm at over 650+ rwhp. I currently have 4 mufflers and a set of helmholtz pipes installed. I also have 4.11 gears installed.

I can't quiet this thing enough. In Virginia, we have a show of speed ticket, which is not good. They are anal about exhaust noise. I just wish this thing didn't attract so much attention from law enforcement.

Do yourself a favor, if you intend to drive this thing hard, get the quietest exhaust possible. If all you care about is showing off, well then....

I gained 15RWHP, and 50RWTQ. just by removing the flowmasters. The dyno sheet are in my build thread.
I'd hate to tell you they do make a difference. I'm at 619RWHP and my car is quiet when I want it to be.

[usmcjlp]

Originally Posted by Inferno LS3

This is funny because I went the other way. I loved the Flowmasters, I even delt with the drone sound on the freeway. On the dyno, it's another story the Flowmasters held me back with my Whipple build and now I went with Magnaflows. The Flowmasters were getting so hot the paint was burning off. The Magnaflows are quiet at idle and part throttle and no freeway drone. You have to be the throttle to hear them. The best part about them was I "could" put my arm through them. Straight through design.

Inferno LS3, I went the same route as you. I started with Kook's 3 inch exhaust and it was terrible. I added a pair of Magnaflows and it was a lot better. Before people start flaming on me, I should explain. I fly F-18s for a living. After 15 years of flying, low pitched hum, such as exhaust drone really bothers me. It makes it unbearable for me. So no insult intended for those of you who like a loud exhaust.

[Inferno LSX]

To each his own. If anyone wants loud, the Flowmasters will do that. I only swapped because of 50RWTQ. Otherwise I'd still have the Flowmasters on.

[Heelhook22]

Originally Posted by sub zero

did u tuned your magnaflow before and how hp u get after ?

Didn't do a tune. I called Magnaflow and asked them if I needed one and they said no. I definitely noticed a low end loss though when I had them installed. My understanding is that you need some backpressure for low end acceleration and the Magnaflows are very free flowing. This isn't a bad thing, but IMHO this is what makes a tune with Magnaflow 3" just about mandatory.

[My 5th]

I had the GMPP axle backs on my SS and liked the sound. Switched to the Magnaflow 16483 3" cat-back and noticed it was much quieter. But that's OK because I knew I was going to add LT's pretty soon. I now have the LT's and hi-flow cats and the Magnaflow sound is PERFECT! Quiet when i want it to be, but lay into it and she now really barks! I've moved beyond needing more noise (when you hit your 60's you can't hear most of it anyway) and my current setup is just what I want.

[mikeSS]

Originally Posted by 2010 SSRS

I would like to switch mine out to Flowmaster also, I have Corsa ls3 with LT's, not loud enough for me, I should had went with Flowmasters from the start.

i feel like corsa is louder than flowmaster ?

[ramsman34]

I have Flowmaster American Thunder cat-back with Thorley shorties and I don't "feel" like I lost any HP or TQ, quite the opposite. But I did the CAI intake, headers, and exhaust all at once. Now imma wondering if in fact Id get more HP/TQ with different exhaust - but the AM Thunder do sound awesome. Drone between 65-75 on the freeway however. If I changed, wouldn't know what to get.

[Inferno LSX]

Originally Posted by ramsman34

I have Flowmaster American Thunder cat-back with Thorley shorties and I don't "feel" like I lost any HP or TQ, quite the opposite. But I did the CAI intake, headers, and exhaust all at once. Now imma wondering if in fact Id get more HP/TQ with different exhaust - but the AM Thunder do sound awesome. Drone between 65-75 on the freeway however. If I changed, wouldn't know what to get.

was gonna add a J tube to kill the drone, but took the American Thunders off and there is next to no drone now. All 3" pipes and mufflers.

[grocerygetter]

magnaflow 2.5 rocks. my goal is around 500hp...we basically left the stock pipes, put a magnaflow x in and extra pipe to fill the gap where the resonator was. Then, did magnaflow stainless mufflers and their resonated tips. Turned out great. Car runs the same...it did get out some of the hesistation at the start of second gear...but the car is on a stock ecm tune at this point as well. could be a learning thing fixing itself. I wanted some lowend throat but nothing 'rowdy'.