Exhaust advice
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From: Fayetteville Arkansas
Exhaust advice
Throughout my life i have had many old ford trucks and lots of foxbody mustangs and my trucks had dual exhaust and my mustangs as well,none of my trucks had a X pipe or H pipe like my mustangs did but now im getting ready to have a new exhaust put on my 1979 F-100 im wondering if i should have a X pipe or H pipe installed and what would be the advantages of running one as opposed to running dual separate pipes. I have heddman thermal coated headers and plan to use Flowmasters for mufflers and more than likely 3 inch pipe, so if anyone wants to chime in with some advice that would be appreciated. Thanks
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From: Fayetteville Arkansas
I thought 3 inch pipe was appropriate for a 460, I'm using a Holley street avenger 770 carb and Edelbrock rpm intake, and aluminum heads and a comp cam are next for my engine so I figured 3 inch pipe would be preferred for my combo
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The 2.5" pipe is 4.9 square inch cross section. The 3" pipe is 7 square inch cross section. With a single exhaust 3" would seem to make sense, but with duals I think it may be too much. Check around, see what the after market is offering in size for cat back systems. Main thing is to maintain flow velocity and too large of a pipe will hinder that. But I am not an expert on this stuff, in fact I could be wrong.
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There will not be any cat-back systems, it's gonna be from the headers back and I figured with around 450-500 hp and 500ftlbs of torque that 3' pipe would not make my truck a dog off the line but I might be wrong, I have some research to do before I get my exhaust done
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Post Fiend
Joined: Jan 2000
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Ideal situation would be if there is dyno testing of different size pipes for same engine similarly set up. Or even similar engine similary set up.
FLowmaster has this chart says 2.5" dual exhaust up to 500 hp, but the chart does not take into account engine size. Discussion above chart good too. Call Flowmaster tech folks since you are buying their mufflers they should give you advice.
Magnaflow has this chart that includes engine size and hp and leaning more towards 3" on a dual for your application although the chart does not have that bid of an engine (stops at 400 cid). See also discussion above chart.
Good discussion here on whether to use 3" vs 2.5" or even 3.5' but are they talking single or duals? And the chart embedded in that link supports your 3" duals.
FLowmaster has this chart says 2.5" dual exhaust up to 500 hp, but the chart does not take into account engine size. Discussion above chart good too. Call Flowmaster tech folks since you are buying their mufflers they should give you advice.
Magnaflow has this chart that includes engine size and hp and leaning more towards 3" on a dual for your application although the chart does not have that bid of an engine (stops at 400 cid). See also discussion above chart.
Good discussion here on whether to use 3" vs 2.5" or even 3.5' but are they talking single or duals? And the chart embedded in that link supports your 3" duals.
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