Ok for a 04 Gt, will a pair of flowmaster mufflers sound nice or do i need to get the whole exhaust kit? I know the whole exhaust will sound better but will the flows make a change?
FlowsMasters Alone?
- Thread starter lbmustang99
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Ryan02Stang
Active Member
It will still sound badass. Then if you get an offroad midpipe you better invest in some ear plugs! 
hognutz
New Member
I would just get the new stainless flows welded in you stock exhaust. then the system will be stainless instead of alumized like the catback.
mcmmotorsports
Member
Only thing bad I can say about it is that welded in muffs will utilize stock crimp bend pipes. More restrictive, supposedly. Who knows what the difference in HP would be between welded mufflers and whole mandrel bent systems. 
GTn00b
New Member
I had weld in flows for 2 or 3 weeks on my gt I loved the way it sounded then I went and bought a Mac off road h pipe and now it is very loud I love it.
smokin'Red35th
Member
I currently have exactly that. completely stock exhaust but with welded in flowmaster 40 series mufflers. Sounds great! but now i want more. off road h-pipe is next to come:d
You wont be dissappointed in the sound!
You wont be dissappointed in the sound!
The 2.5" cat-back systems will add about 4 rwhp and up to 0.2 sec on ET over just welding mufflers to factory tubing. I have sources for this information if interested.mcmmotorsports said:Only thing bad I can say about it is that welded in muffs will utilize stock crimp bend pipes. More restrictive, supposedly. Who knows what the difference in HP would be between welded mufflers and whole mandrel bent systems.
NewStangNewbee
Banned
- Jul 2, 2004
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This informative article discusses several cat-back kits and the table at the end shows the best ET with each.NewStangNewbee said:
http://www.allfordmustangs.com/Detailed/70.shtml
It was for a 90 LX 5.0, but I think the trends should be similar for 94 to 04 GTs.
The site seanhylandmotorsports.com used to have an outstanding article where they dyno tested numerous bolt-on mods on a 2000 GT. It looks like the article was published in the February 1999 issue of 5.0. Luckily, I printed the article.
Anyway, they dyno tested 4.2 rwhp with a Dynomax 2.5" cat-back with Ultra Flow (straight thru) mufflers.
JBushman73
Founding Member
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Get two American Thunders welded in and have them cut off the last two cats. Now that will sound bad as*.
Get two American Thunders welded in and have them cut off the last two cats. Now that will sound bad as*.
mcmmotorsports
Member
What about cutting the first two?JBushman73 said:Get two American Thunders welded in and have them cut off the last two cats. Now that will sound bad as*.
kboy262
Active Member
JBushman73
Founding Member
First 2 cats are a no go. 
One of the front 02 sensors is built into the drivers side cat. Leaving the front two aren't a big deal since they are so small. The back two are pretty large cats.
You need to leave the first two to pass a visual state inspection not to mention your computer will not like that. Yea you can get an O/R H for 120 and spend a few hours putting it on. But do you want to have to take it off and put your stock exhaust on every year for inspection. People sware I have a O/R H on mine but I just tell them I cut the rear 2 cats off and show them.
Of course MIL's would eliminate the computer problem with O/R H pipe. Cut my back two off and no computer problems here. I cut the last 4 of 6 cats on my 98 and didn't have a problem either. I never did have to use the MIL's I bought for it.
One of the front 02 sensors is built into the drivers side cat. Leaving the front two aren't a big deal since they are so small. The back two are pretty large cats.
You need to leave the first two to pass a visual state inspection not to mention your computer will not like that. Yea you can get an O/R H for 120 and spend a few hours putting it on. But do you want to have to take it off and put your stock exhaust on every year for inspection. People sware I have a O/R H on mine but I just tell them I cut the rear 2 cats off and show them.
Of course MIL's would eliminate the computer problem with O/R H pipe. Cut my back two off and no computer problems here. I cut the last 4 of 6 cats on my 98 and didn't have a problem either. I never did have to use the MIL's I bought for it.
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