I put mine on a week ago. It took a few days . Say 50 miles or so...

 

just got mine! how do you like them?

 

I like mine, if I were you i would loosen the midpipe from the start. Then I bet you can change them out without fully removing the rear hanger on both sides. The bolts on the rear hanger are a real bear to get back in.

 

Love em. The drone is very tolerable. I had flows (2 chamber) on my 96 Cobra . Bad drone! These tend to be pretty quiet until you stick your foot into it. Which IMHO is perfect.

 

thanks....can't wait to put'em on!

 

HiRoller, you going to the place I recommeded you to?

 

Thanks, but I actually got them from Summit....They were $275, but shipping was free. (2 days!) so, it was about the same price after shipping.

Could you maybe PM me the phone number of that mustang expert. I've got other stuff i want to do with my car that would be easier in a shop.

 

Thats what I did on my car. I just took and loosened the clamps on the midpipe and Slid them towards the rear of the car onto the mid pipes and then slid the whole assembly towards the rear of the car and by doing that it gets the whole thing away from the H-pipe. THen you can unbolt the mufflers of the pipes and slide the pipes off and then slide the mufflers off the hangers once they are free from the mid pipes. Its easyer than taking off the hangers.

 

They havent dyno proven the power gains and they are basing it off the gains they have gotten on a 03 GT mustang with an x pipe and mufflers. But I highly doubt it. I really like the sound of the spintech's. Definately louder and deeper than any of the flowmasters I have heard. But that is how much I paid. I have been so busy that I havent been able to post a sound clip or Pictures.

 

Wish I had thought of it before I took the first one off. Would have made the whole job a snap. Second one was a breeze.

 

I just ordered a set a flowmasters and should have them sometime this week. I was wondering if there's any need to reset the computer or will it learn the new set up over time. Also I was wanting to know if anyone noticed any horsepower gains, I've read a few post where people were saying it actually lost like maybe 2hp which is no big deal but I wanted to know if anyone has proven that.

 

I doubt you would loose any HP, besides 2 hp you would never notice anyway. For those of you that installed the flowmasters, then installed a CAI, did you notice more drone? I had my flowmasters on for a few weeks, and just last week I installed my Airaid CAI. The 1600-2000 rpm drone is so deep now it reverbs the entire car. It gave my A pillar cover a rattle. I don't really mind but some people might.
Also, no need to disconnect the battery for just the mufflers.

 

My Flowmasters acutally have to be sent back to Flowmaster for the weld problem in the right muffler, and it seems a lot of kits are affected with this weld coming loose and making a annoying rattling sound. Good thing these Flowmasters got warranty's.

 

Are the American Thunder mufflers 40 or 50 series mufflers or something different yet?

 

I didn't get the American Thunder kit I just put on a set of 40's. Am I the only one that did this?

 

Here's a chart that tells you everything you need to know...

Aft-Axle Exhaust Comparison as Tested by Muscle Mustangs & Fast Fords

The Flowmasters in this test show a significant increase in power below 3000 RPM, and then mostly 1-2 HP & Torque gain from there on up.

 

I'm getting the same rattle. I just assumed it was the change in weather because after it heats up the annoying rattle goes away. Looks like I'll have to get under the car and inspect.

Maverick,

At which weld joint should I be looking at?

Thanks

 

I had the same problem,,,Bolt came off one of the mufflers..JohnnyT

 

No, its a weld inside the passenger side muffler.

To do the test, take a rubber mallet, and start tapping the muffler from the bottom of the muffler, if you happen to hear the rattle, call the shop or co. you bought the kit from, they will send you a replacement kit out to you and have you send the old kit back to Flowmaster. Flowmaster is aware of this situation with the defective 05 Flowmaster kits, just for everyone else's info if they happen to get it.

 

I just put mine on two weeks ago or so. Is there a stock number or something you can check for to see if you got a set of the bad ones?