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Old 08-15-2013, 02:03 PM   #1
Jasonwayne222
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Default what size exhaust pipes

I have a 302 with about 330hp 320torque. I have long tube headers and am about to buy a new exhaust system. I am thinking of getting a 2inch system with an hpipe. And using flowmaster 40s. Any suggestions

Also my headers are wrapped and do an excellent job of keeping in the heat. Will I gain anything other than appearance buy switching to ceramic coated headers.
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Old 08-15-2013, 02:15 PM   #2
drunkyoda
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i would think 2" is a little too small. with that much hp you gotta be pushing some air through there! so i would suggest 2.25" that way you keep your back pressure and dont lose tq but will also get better air flow to make some more hp up top.
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Old 08-15-2013, 02:30 PM   #3
1slow67
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I would do at least a 2.25" exhaust if not 2.5", 2" is too small to me.
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Old 08-15-2013, 02:34 PM   #4
TexasAxMan
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K codes came with 2" pipes ...
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Old 08-15-2013, 03:02 PM   #5
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scince you have long tubes I would go with 2.5" mid pipe and all the way back till the last 16 to 18" then use some 3" tips .

The long tubes provide plenty of torque and your not gonna loose that much by openin up the exhaust to 2.5" if any at all. The 3" tips will deepen the tone as it exists the tail pipes .
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Old 08-15-2013, 04:28 PM   #6
67mustang302
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2.5" is common, plenty of kits out there. Wrapped headers have a tendency to hold moisture in the wrapping and eventually corrode through, so ceramic helps there but are expensive.
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Old 08-19-2013, 08:46 PM   #7
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Minimum 2 1/2 for that setup.
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Old 08-19-2013, 10:38 PM   #8
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Old 08-20-2013, 01:27 AM   #9
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i run 2" Shelby gt350 glasspack side exhaust from tri-y. love the combo
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Old 08-20-2013, 03:19 PM   #10
Jasonwayne222
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I think im goin with patriot ceramic coated long tube headers with 1 1/2 primaries 3" collectors with 2 1/4 tubing with an h-pipe and flowmaster 40s
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