2007 Mustang GT: MBRP Street Catback Opinion

[007Stallion]

Hello to Everyone,

First time introducing myself on the forum, been lurking here just shy of a year. I’ve found a lot of useful information here.

Anyway, currently installing a set of Kooks 1-3/4” headers with their catted H-pipe. Been having some issues since 5 of the 16 studs decided they are staying in the head.

As far as finishing out the rest of the exhaust, I have considered the following options:

1. Borla S-Type Catback
2. MBRP Street Catback
3. Mid-mount Black Widow Venom 250 or Race Venom DI/DO muffler.

Bought the car just over a year ago and have been getting it into shape since. Car originally had stock manifolds, pypes O/R X, and Pype Bomb axle back. Car was extremely loud with all the associated drone, trumpeting, and other ridiculousness. Cold starts can be heard 3 counties away.

Still looking for and aggressive sound (installed Hot Rods last summer) at idle, but want to stay away from all the trumpeting and drone. Also, I have neighbors so not wanting to wake them in the morning. Car is a weekend cruiser and my wife will take it to work sometimes during the week. I work out of town, so it’s not a DD.

Right now I’m leaning towards either the MBRP Street of the BW mid mount muffler. I’ve read tons of posts here and watched hundreds of YouTube videos. Most of the MBRP videos I’ve seen are S550 Mustangs.

I appreciate any thoughts, experience, or recommendations. Looking for an exhaust that will produce a deep rumble at idle with the cams, minimal drone, rasp, and trumpeting.

On a scale of 1 (Stock) to 10 (straight pipes) I can deal with a 6-8 on loudness.

-Bill

 

[Juice]

Cats do wonders for toning down exhaust, and may even increase torque midrange. Having an offroad pipe was your biggest contributor to noise level.
Mufflers are a preference item, make no measurable power difference.
A straight through muffler like the SVE SSS from LMR is mellow with cats and longtubes. But stupid loud with offroad pipe IMO.

 

[007Stallion]

Juice,

Thanks for the feedback. The O/R X was definitely not helping, but I bought the car with that setup and didn’t feel like messing with it till I could afford to just do everything right the first time.

Was hoping the high flow cats would help to tame things down a bit.

I agree that exhaust is definitely a preference thing, and one man’s trash is another man’s treasure. Just looking to see if the setups I was looking at would get me where I want to go.

The following video is what I am hoping to get close to. I know it’s a different engine, catless headers, etc., but hopefully it would be close.

 

[ghunt81]

Well, if you're interested, here's what my car sounded like with a high flow catted H pipe, stock manifolds and the MBRP axle back:

It was pretty loud but tolerable. The MBRP street axle back is pretty loud once you no longer have stock cats.

 

[007Stallion]

That’s a pretty good sounding setup ghunt. I’m old school and think muscle cars should be loud, but tolerably so.

Do you remember how the drone was with that setup? The drone from the straight pipes was unbearable on longer drives.

Had to turn the shaker 1000 stereo up at least 2/3 just to hear it over the drone from about 1800-2200 rpm. I can deal with some drone, but too much is too much, lol.

 

[ghunt81]

I had that setup on the car almost 10 years ago so I don't really remember no...I was driving it 50 minutes each way to work at the time though so it must have not been too bad. I changed it out for an H pipe a little later and have had it with an H pipe ever since.

 

[OvalSports]

I have a unused set which we could not use with our 2006 coyote swap 3” system. Send a PM if you’re interested, and I’ll send pictures.

 

[007Stallion]

Thanks for the offer OvalSports. Still deciding which way I want to go. I don’t think I have PM privileges yet

 

[Daniel Roberson]

Not answering your question but highly not recommend anyone to not buy the mac axle backs it is so loud with Kooks longtubes noticeably more than other cars with full-bolt ons. Welcome to the board.

 

[ghunt81]

Man everything is loud with longtubes. I tried out my MBRP axle backs a couple years ago (first time since I had put on the headers), they sounded amazing but were stupid loud. Now I have chambered mufflers and even added some resonators in the middle to tone it down a bit. Still loud but not as ridiculous.

 

[Monkeyporn]

GO WITH THE SLP LOUD MOUTH AXLE BACKS YOUR NEIGHBORS WILL THANKS YOU....!!!!!

 

[Forty61]

Not answering your question but highly not recommend anyone to not buy the mac axle backs it is so loud with Kooks longtubes noticeably more than other cars with full-bolt ons. Welcome to the board.

I LOVED my MAC mufflers with the factory manifolds and mid pipe but the second I went to long tubes and catless they were unbearable. I had also previously had them on my Bullitt and that was, in my opinion, the perfect combo.

I’m back to some worn out factory mufflers now and it sounds pretty good, still a little shouty in the midrange but way better.

 

[Daniel Roberson]

I LOVED my MAC mufflers with the factory manifolds and mid pipe but the second I went to long tubes and catless they were unbearable. I had also previously had them on my Bullitt and that was, in my opinion, the perfect combo.

I’m back to some worn out factory mufflers now and it sounds pretty good, still a little shouty in the midrange but way better.

I never liked those big trashcan mufflers and I hope I'm not pissing you off saying this. I guess my biggest problem is it can be really loud in the cockpit and I'm sure the cops know my location. I have been told muffler suggestions in the past but my wife I have to live with and she is tired of me modding so much if you know what I mean.

 

[Daniel Roberson]

Do you still have your Bullitt mufflers around some where they had great-looking tips.

 

[Forty61]

Do you still have your Bullitt mufflers around some where they had great-looking tips.

I don’t or they’d have ended up on my CS. I sold those way back, luckily I scored some Shelby GT mufflers for $50 a few years back and I’ve run them since.