Straight Pipe Build
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Trailering
Joined: Jul 2012
Posts: 16
Likes: 2
Straight Pipe Build
Wanting to know if there is a nominal size diameter pipe to use for building a set of straight pipes. On my 78 I have a 5" OD pipe, 26" long, and it is not loud to me, (no muffler), just sounds nice. I have a 79 I am building up and a 73 as well and I want straight pipes for both. I can get 8", or 4" drill pipe kind of easy, but want to know if someone out there has used any other size pipe. I am not into loud pipes, I just like the old school 70's sound. Any help would be appreciated.
Hotshot
Joined: Feb 2004
Posts: 10,810
Likes: 2,606
From: The Shenandoah Valley
I think that you should do the 4" pipe straight out the back though, create a new normal.
Straight pipes were not normal sounds in the old days as we were tight wads not wanting to waste date money on tickets. I never ran straight pipes on a car or truck on public roadway, but I still got a few tickets for improper exhausts. I wrote a few tickets for them too later on, it's considered by many as a "good stroke".
Straight pipes were not normal sounds in the old days as we were tight wads not wanting to waste date money on tickets. I never ran straight pipes on a car or truck on public roadway, but I still got a few tickets for improper exhausts. I wrote a few tickets for them too later on, it's considered by many as a "good stroke".
Cargo Master
Joined: Nov 2007
Posts: 2,238
Likes: 475
If you want the old school sound you'll want to run 2.5" down each side WITHOUT any crossover pipes or mufflers or maybe just some straight through Cherry Bombs or Purple Hornies( if they still exist???), that was what the majority of people ran back in the day. I knew a guy with a '76 F250 that had a 6" lift and dual 3", literal straight pipes no mufflers, on a well built 460 with headers, exiting out the back and you could hear that thing coming or going for miles....it was ridiculously loud even under light throttle.
Generally speaking, before running into major restrictions, a single 2.5"/dual 2" system will support around 300HP, a single 3"/dual 2.5" system will support around 500HP, a single 4"/dual 3" is good to around 750HP and a single 5"/dual 4" can support 1000HP+. Turbocharged engines generally like a larger exhaust to minimize drive pressure. Anything over a single 5"/dual 4" is just for show.
Generally speaking, before running into major restrictions, a single 2.5"/dual 2" system will support around 300HP, a single 3"/dual 2.5" system will support around 500HP, a single 4"/dual 3" is good to around 750HP and a single 5"/dual 4" can support 1000HP+. Turbocharged engines generally like a larger exhaust to minimize drive pressure. Anything over a single 5"/dual 4" is just for show.
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