I have seen a lot of people on here with the magnaflow muffs and also the flowmaster muffs. Im trying to decide which to go with. Also debating on whether or not to cut out the resonator with either of the two setups. Any opinions or sound clips of either setup would be awesome!!:th_thumb-up:
Magnaflow VS. Flowmaster???
- Thread starter Gearhed42
- Start date
Zef_66
New member
On my last Grand Prix, I removed the cat and resonator, and kept the stock mufflers. I replaced those with a 3" pipe from downpipe to Y. I liked how this sounded.
On my current GP, I was looking to go a little louder, so I went with the Borla Pro XS mufflers, magnaflow high flow cat (for emissions purposes), 3" from dp to Y, and 2.5" back to mufflers. I really like the sound of this, but I have a little drone that I want to get a resonator to take care of.
Personally, I don't like either flowmaster or magnaflow mufflers on our cars.
On my current GP, I was looking to go a little louder, so I went with the Borla Pro XS mufflers, magnaflow high flow cat (for emissions purposes), 3" from dp to Y, and 2.5" back to mufflers. I really like the sound of this, but I have a little drone that I want to get a resonator to take care of.
Personally, I don't like either flowmaster or magnaflow mufflers on our cars.
Sabrewings
New member
I get compliments often on my Magnaflows. Even from some LS4 owners. 
Custom 2.5" piping, no res, dual Magnaflow XL 3-chamber mufflers. (pretty similar to GMPP exhaust kit's mufflers)
Custom 2.5" piping, no res, dual Magnaflow XL 3-chamber mufflers. (pretty similar to GMPP exhaust kit's mufflers)
Sabrewings
New member
I've never heard that, and they definitely don't sound alike. Not sure what difference it would make anyway.
Well ive always liked the flowmasters and ive never really heard magnaflow so im just trying to decide which to go with. GMPP = gm performance parts right? So does that mean they are relatively quiet? And how is it without the resonator? Everyone keeps saying raspy or fart can sounding?
Sabrewings
New member
With no res, they're somewhat loud with throttle (or during warm up), but not loud at idle (once at operating temp). With the DP they've gotten a bit louder. And yes, GMPP is GM Performance Parts
Like I said, I get compliments from LS4 owners so it can't be that bad.
archemedes
New member
borla is great but expensive
Zef_66
New member
Borla are not expensive, as far as I am concerned. I took the following prices from Wicked Nicky exhaust. The only site you will ever need for low prices on high performance exhaust systems and more.
Flowmaster 40 Series Delta Flow Muffler, 2.50" IN (O) / OUT (C): Nicky's Price: ea $82.39 PN 942541 Retail Price: $109.85
Borla Pro XS Muffler - 2 1/2" offset inlet / 2 1/2" center outlet (a)2 1/2" inlet dia (b) 2 1/2" outlet dia (c)14" shell length (d)4" shell height (e)9 1/2" shell width PN 40358 Nicky's Price: $74.00
Oh, and Flowmaster are made of regular steel. Borla are stainless steel and are warrantied for 1 million miles. And I think my Borla's sound nicer than every Grand Prix with flowmaster.
But just a note. Sound is something subjective. Meaning, I may like the sound of my car. You may not. Ricers evidently like the sound of fart cans. I do not. Some people like 22" rims, some don't. So take everything FWIW and with a grain of salt....even my advice.
IndeedSS
SS-DD Level Member
My exhaust system TOG's>>Hogan 3" catted DP>> GMPP catback plumbiing>>MBRP resonator>>Borla XS Pro's>>Magnaflow 15* rolled edge tips.
The resonator helped slightly with drone but the Borla's were a night and day difference in killing drone and V6 fartiness.:th_thumbsup-wink:
IndeedSS
SS-DD Level Member
Mine is a hybrid, because the resonator went bad and it seemed as if the sound deadening of the mufflers burned out like glasspacks do. IMO, leave your resonator in place and add the borla muffler(s). It's good to have the Ubend removed but not the resonator. On a V6, the quieter the exhaust system the better.
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IndeedSS
SS-DD Level Member
If you are going to BGPM, wait and listen to as many systems as you can. One thing though, some mods will effect the sound. SO what you hear may not be exactly what your car wids up sounding like.