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Old 02-10-2011, 07:05 PM
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exhaust size

I am torn between 2 1/2'' or 3'' exhaust pipes. I have a 358ci, 3x2, 455 lift torque cam, 200 cc heads, 1 3/4 shorty headers with 3'' collecters. Leaning for 2 1/2 with Flow Masters for back pressure.

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Old 02-10-2011, 09:07 PM
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Your biggest improvement will come from long tube headers, if they'll fit. 1-5/8" primary tubes will be best.

Otherwise, use the 2-1/2" pipes, w/an "X" (Dr. Gas, etc.) between the two sides after the pipe is level w/the ground and before the low restriction mufflers. Put the mufflers as far rearward as practical.

It's not that the 3" pipes would hurt, it's just that you don't need them w/your combo, unless it's a school bus-length vehicle. Plus the 2-1/2" pipes are cheaper not to mention MUCH easier to run under the car.
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Old 02-10-2011, 09:11 PM
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the 2.5 will give you more then enough breathing room.....i dont see you mentioning and X pipe or H pipe. adding the crossover flow will greatly improve your engine low end torque.....thats no BS
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Old 02-11-2011, 08:16 AM
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I am glad this question was asked. I was just given a 2in true dual exhaust for my 86 chevy truck. How do you determine the location of an H or X pipe? Can you make your own H pipe just by cutting out a hole on each pipe and connecting them with another pipe?
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Old 02-11-2011, 08:19 AM
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Quote:
Originally Posted by cjoform
I am glad this question was asked. I was just given a 2in true dual exhaust for my 86 chevy truck. How do you determine the location of an H or X pipe? Can you make your own H pipe just by cutting out a hole on each pipe and connecting them with another pipe?
Usually, the placement will be dictated by the available space and clearance. But basically you want it aft of the collectors and before the mufflers.

You can do a simple "H" connection between the two sides like you describe. A smooth "X" is better, but either is an improvement over having nothing.
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Old 02-11-2011, 08:26 AM
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Alright thanks for the response Cobalt. I will have to get to work on that someday.
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