Another muffler question

82 GT · 03-07-2002, 11:30 PM

When I go to buy my mufflers, which measurement do I want to look for? The I.D or O.D measurement for the factory 2 1/4 exhaust. That gets confusing sometimes. Do I want 2 1/4 I.D inlet/outlets or do I want 2 1/4 O.D inlet/outlets?

Mr 5 0 · 03-08-2002, 12:29 PM

If your using the stock 2 1/4" flowpipes and tailpipes get 2 1/4" mufflers.

If you choose to replace the flowpipes (between the cats & the muffler) and tailpipes with 2 1/2", get a 2 1/2' muffler.

You may need to replace both flowpipes and tailpipes because sometimes when you try to remove an old, rusted muffler, the connecting pipes are rusted so bad they can't be saved - but not always.
If that happens you're better off with the stock 2 1/4" muffler(s) for now unless you're prepared to replace the entire exhaust system, which you stated earlier that you're not.

FYI: Flow pipes are about $15. each, GT tailpipes can be had for $25. each. Both are available in 2 1/4" or 2 1/2" sizes.

03-07-2002, 11:30 PM	#1
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Another muffler question When I go to buy my mufflers, which measurement do I want to look for? The I.D or O.D measurement for the factory 2 1/4 exhaust. That gets confusing sometimes. Do I want 2 1/4 I.D inlet/outlets or do I want 2 1/4 O.D inlet/outlets? __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

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03-08-2002, 12:29 PM	#2
Mr 5 0 Conservative Individualist Join Date: May 1997 Location: Wherever I need to be Posts: 7,487	If your using the stock 2 1/4" flowpipes and tailpipes get 2 1/4" mufflers. If you choose to replace the flowpipes (between the cats & the muffler) and tailpipes with 2 1/2", get a 2 1/2' muffler. You may need to replace both flowpipes and tailpipes because sometimes when you try to remove an old, rusted muffler, the connecting pipes are rusted so bad they can't be saved - but not always. If that happens you're better off with the stock 2 1/4" muffler(s) for now unless you're prepared to replace the entire exhaust system, which you stated earlier that you're not. FYI: Flow pipes are about $15. each, GT tailpipes can be had for $25. each. Both are available in 2 1/4" or 2 1/2" sizes.