Hey all. Long time listener, first time caller. I did a search and could not find what I was looking for, so sorry if this discussion is beating a dead horse. I have an 08 GT and want to get a flowmaster axle back exhaust. I believe the inlet/outlet size I need is 2.25". If I wanted to get 2.5" inlet/outlet, using the stock pipes, will it still work? The reason I ask is because the tips I want to get with the mufflers has an 2.5" fitting.

Also, is there a noticeable sound difference between the Flowmaster American Thunder and the super 44's? Thank you in advance for any help you could provide.

 

I'm not sure what you're asking. If I understand correctly, you are mistaken. Your stock pipes are 2.5", not 2.25". So yes, if you got 2.5" axle-backs, they would obviously work, being as how the piping is the same size as your stock pipes are.

I have SLP Loudmouths with 2.5" piping and they fit perfectly.

 

stock your car has 2.5" tubing and i suggest you go larger in tips...flowmasters arent a favorite of mine. most people here will suggest Borla, magnaflow and SLP over chokemasters. YOUTUBE will help you a lot as well

 

I second that. If the outlet is 2.5", that is way too small and the holes in the bumper will not be filled in and it will look puny.

Unless you have your heart set on Flows, you should look around. Just remember that they aren't your only option.

 

ok i was about to get the american thunder set up but now i'm not sure after reading this.... i would like something thats louder than stock but i'm not sure what to get.. magnaflow seems like it sounds about the same as stock..

 

Like Stanger suggested, YouTube is a wonderful tool for aiding in the hassle of choosing an exhaust. I wasn't sure what to get either. I went on YouTube, listened to SLP, Borla (which was my second favorite), Corsa, Magnaflow, Pypes, Flowmasters, Bassani, etc. The SLP's were exactly what I wanted and I was sold the second I heard them.

Always remember that videos aren't always an accurate representation of the car's sound. Some sound better in person, some sound worse. Look for videos that have an array of angles and distances i.e. close to the car, further away from the car. Also look for videos that do passes, revs, idles, and start-ups that way you can get the best possible idea to how the exhaust will sound.

 

this is a hard decisiion but the slp's do sound pretty good and the mac sounds alright also... anything bad things about mac?

 

Thank you for all the replies. You did answer what I was asking and thank you. The exhaust tips I was going to get were 2.5" at the muffler and 4" at the bumper, so it should fill out the cutots nicely. For whatever reason, I thought the stock piping at the muffler was 2.25", but if you say it is 2.5", well that is good enough for me. Thanks again!

 

http://www.youtube.com/watch?v=7zdkcZozWKE

thanks blacksunshine and this video helped me a lot loudmouths it is...... they sound bad *** on this car

 

I don't know about Mac, but from what I have heard, they are pretty good.

4" will fill the cut-outs very nicely.

This is the video that sold me on the SLP's.

http://www.youtube.com/watch?v=S8MUS...eature=related

 

Don't get Flowmasters......They sounds almost identical to stock.

SLP or Borla all the way.

 

Check out the Ford Muscle article on it. They have before and after clips.

 

Mac is great that's what I run

 

I have Magnaflow Magnapacks on mine which are similar to the loudmouths in design. Sound pretty close to what was in that video too.

Note. while the super agressive exhaust does sound great and turn heads, you might want to consider how much of it will resonate to inside the car while driving.

In hindsite I kind of wish I'd have gone with the reuglar magnaflows vs. Magnapacks just to cut down on the drone heard inside while driving. If you like hearing your stereo or holding a conversation with a passanger, the drone can get kind of old. Some of my problem could be form the Bassani X-pipe which I've been told is known to be noisy.

Mine is a 2000 GT so maybe the soundproofing is better on the newer models ...

 

Here is an install article with a review and with a video of stock and then Flowmaster axle back kit installed.

http://www.fordmuscle.com/archives/2...lers/index.php

 

I'm sorry, but my car with flowmasters sounds nothing like stock. Even before the headers and xpipe, it sounded nothing like stock.

 

awesome. Thanks for the link!

 

Is the SLP just a straight pipe or does it have a muffler?? Once again its a hard decision but the SLP sold me on how loud it is when your getting on the gas

 

4 inch tips for sure. Buddy has an 07 GT with the mac boom tube axel back. Sounds pretty damn good. There worth checking out.

 

Your car is also totally different from ours....

The MAC sounds really nice along with SLP, Borla, and Magnaflow. The Pypes also sounds good but they're pretty damn loud. And as to the drone issue almost every exhaust I've heard has some drone in it, but that's not all due to the axle-back you pick.

Plus, our cars are much more insulated than previous models.

 

The SLP Loudmouth are basicallys straight throughs. The Power-Flo is the Loudmouth with a muffler on it.

I will give you a word of warning; if you choose SLP Loudmouths and you combine them with long tubes and an X pipe in the future, your **** will be the loudest Mustang in town.

 

can you put that slp x-pipe on without having headers???

 

Not if they're shorties....which is all I found. Regular length x-pipes work with stock exhaust manifolds.

 

This works with stock everything including catback.

http://www.americanmuscle.com/slp-x-...tted-2005.html

 

yea thats the one i was looking at last night... hopefully i will be able to get it sooner or later.. just got my wife a new car so that throws my plans back further

 

The only real difference is that yours is a 3V. If you put flowmasters on there, its gonna sound quite a bit different then stock.