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91LX2Bfast · 10-27-2001, 02:46 PM

Hey, haven't had to ask a question for a while untill now.
I have been reading that alot of people have 2 1/2" mufflers welded onto their stock pipes. How does this work? Is the outside diameter of the 2 1/4" pipe close enough to the 2 1/2" ID of the muffler? Or do they use a reducer? Just wondering because my brother is about to purchase some mufflers for his 99GT.
I just put 2 1/4" in Flows on my stang because thats all that I thought would fit. As always, any help is appreciated.

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1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, MAC U/D pulleys, KVR front brake upgrade. 15.2 @ 91 before exhaust & pulleys. Not bad for a 3800lb auto 4.6L

No Longer own: 91 LX 5.0L 5 spd

10-27-2001, 02:46 PM	#1
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	2 1/2" mufflers on stock 2 1/4" pipes? Hey, haven't had to ask a question for a while untill now. I have been reading that alot of people have 2 1/2" mufflers welded onto their stock pipes. How does this work? Is the outside diameter of the 2 1/4" pipe close enough to the 2 1/2" ID of the muffler? Or do they use a reducer? Just wondering because my brother is about to purchase some mufflers for his 99GT. I just put 2 1/4" in Flows on my stang because thats all that I thought would fit. As always, any help is appreciated. ------------------ 1997 Thunderbird 4.6L: Dynomax cat-back, MN-12 perf. offroad downtubes and Y-pipe w/ Magnaflow resonator, 80mm MAF with cone filter, B&M trans cooler, Inject-Tech chip, MAC U/D pulleys, KVR front brake upgrade. 15.2 @ 91 before exhaust & pulleys. Not bad for a 3800lb auto 4.6L No Longer own: 91 LX 5.0L 5 spd