Magnaflow vs. SLP catback opinions

**TransAmSpeed** · 06-24-2011, 11:21 AM

I am new to the forums here and have been debating between the dual/dual magnaflow catback part number 16723 or the SLP LM1 catback.

Basically I am wanting a deep rumble sound, but also fairly loud (I like to be noticed hehe).

Would the magnaflow meet the 'loudish' requirement? I have heard it isnt loud at all and that it is loud. But so far its looks with the molded bumper is amazing.

Opinions are definitely wanted because I am going to try to get a catback soon after I decide.

Thanks

***SMWS6TA*** · 06-24-2011, 11:41 AM

This is mine, Pacesetters LT with TS&P ORY, and Razor muffler. I have a Magnaflow on now because the headers blew out the baffles after this video but it sounds just as mean.

You can hear the baffles starting to go (the rasping sound)

View Video on FQuick

Just giving you some options, this setup plus the Magnaflow cost me about $550

**Deezl SS** · 06-24-2011, 12:38 PM

I have both. On my 2000 which is a DD, I still have the stock manifolds and y pipe along with the magnaflow catback. To me, it's perfect for a DD. It has a nice deep tone but it isn't loud. I have the LM1 on my 98. When I had the stock manifolds and y pipe it sounded great but was more loud than deep and had some drone at highway speed. After I added longtubes and catted y it got really loud but lost some of the drone. I then cut out the resonator and added a magnaflow bullet and that cured all of my drone and gave it a nice sound. To sum it up, loud = LM1 and deep mellow = Magnaflow. Adding headers and y will change the sound of both.

**Mike0202** · 06-24-2011, 05:37 PM

I have Loudmouth 1, with PS long tubes and high flow cats. There isnt any rasp, just alittle drone. Its no where near as bad as people make it out to be. I actually think its very quiet at idle and driving around. WOT is pretty loud but isnt that the point?

LM1 gets my vote.

**Mr. Luos** · 06-24-2011, 05:54 PM

I will never suggest an SLP catback. I had to remove the loudmouth from my car once I had a cam and longtubes. Sounded like shit.

I will never use anything but Magnaflow anymore.

**AKA Speedy** · 06-24-2011, 10:17 PM

Originally Posted by Mr. Luos

I will never suggest an SLP catback. I had to remove the loudmouth from my car once I had a cam and longtubes. Sounded like shit.

I will never use anything but Magnaflow anymore.

Absolutely agree!!!! I've had Borla (Custom set up/not CAT back), Dynomax, Flowmaster, GMMG Clones, Straight pipes (against my will... for a day), and now Magnaflow for about 6 months now. The Best set up ever! wouldn't use anything else!!!!!!!!!!!!!!!!!!!!

**wileyCoyote** · 06-24-2011, 10:39 PM

i have magnaflow on mine. nice deep sound, not obnoxiously loud, ...no highway "drone" problem.. plus magnaflow uses quality 100% stainless steel, lifetime warranty.

**Y2KPewterSS** · 06-25-2011, 09:56 PM

SLP catbacks and SLP parts

**Mike0202** · 06-26-2011, 11:14 AM

Originally Posted by Y2KPewterSS

SLP catbacks and SLP parts

I dont know I kinda like my slp lid I got for $89.

***SMWS6TA*** · 06-27-2011, 08:21 AM

their lids and line locks are good, but everything else see Y2KPewterSS for my response.

**Mike0202** · 06-28-2011, 01:37 PM

Originally Posted by SMWS6TA

their lids and line locks are good, but everything else see Y2KPewterSS for my response.

Theres nothing wrong with the cat back its light and flows great. I wouldnt buy a cam from them though

**pajeff02** · 06-28-2011, 01:41 PM

Magnaflow P/N 16723:

'nuff said.

**WS6Dream** · 06-30-2011, 09:48 AM

Originally Posted by pajeff02

Magnaflow P/N 16723:

'nuff said.

That looks convincing to me lol ^

**TXZ28LS1** · 06-30-2011, 12:44 PM

SLP Loudmouth 1 is very bad ass sounding. It sounds great if you dont have longtubes, and a ory. Once you do, it is very loud, and raspy. I have had LM1, Flowmaster, Dynomouth, Magnaflow and now TSP true duals. Honestly true duals is the way to go. Magnaflow is too quiet. If not TSP Duals, i would highly go with Hooker catback over magnaflow.

**blackbird0230** · 07-01-2011, 11:42 AM

Magnaflow part #16723.... Tips, lol
Got magnaflow bullet mufflers through a true dual system. Perfect to me. The catback was quiet and I liked it but this to me is 100x better

**RyanJM** · 07-02-2011, 10:01 AM

I run the SLP Power Flo catback and love the sound. Though a LM2 would be better if you want louder. Mine keeps my car deep and loud enough at WOT but can still talk on the phone if I need to. Just tried this cause I got a deal off a company I oreder parts though when it 1st came out and can't say I would ever trade it for a magnaflow or anything except maybe a GMMG.

**Mike0202** · 07-02-2011, 11:19 AM

I love how people think loudmouth is so loud. Summer nationals was this weekend and some of the cars there were 50 times louder than mine

**LSCyaL8R** · 07-12-2011, 10:27 AM

I am going through the same dilemma right now. Not sure which route to take. My hawk is stock but the muffler is going. It's the original chambered SLP muffler that came from the factory on the hawk. Louder than a stock bird but not LM loud by any means. I actually LOVE the sound of the stock hawk exhaust but I don't think there is any way to get another muffler exactly like the original SLP system. My pipes seem to be rotting a bit too hence my desire for a full cat back.

I seemed to remember slowass having a magnaflow but i can't remember which kit you had curtis. I know pajeff has a magnaflow and cats and his car is so quiet at idle that you can't hear it. lol. leaves me in a tricky spot. I want something that's more or less just as loud as what i have now. though i'm sure the big magnaflow would be almost perfect if i went with no cats but i plan on keeping the car somewhat emissions legal.

**cammed goat** · 07-12-2011, 01:45 PM

My old Beretta GTZ had a Magnaflow stainless cat and muffler connected via a custom 2-1/2" cat back pipe and resonator. Deep, low idle and a nice low growl at 4k rpm.

If you were to go with headers AND the Magnaflow, your car will sound like this...