3-inch exhaust
Senior User
Joined: Apr 2007
Posts: 375
Likes: 0
From: Glenwood, IA
Originally Posted by Torque1st
From my files...
SUGGESTED EXHAUST PIPE SIZES:
Engine HP; SINGLE/DUAL
=============================
200-300; 3.0"/2.25"
300-375; 3.5/2.5
375-450; 4.0/3.0
450-550; 4.5/3.5
550-650; 5.0/3.5
650-800; ---/4.0
800-1000; ---/4.5
1000+++: ---/5.0
STRICTLY DAILY DRIVER- GO DOWN ONE SIZE
BIG NITROUS- USE ONE SIZE BIGGER
SUGGESTED EXHAUST PIPE SIZES:
Engine HP; SINGLE/DUAL
=============================
200-300; 3.0"/2.25"
300-375; 3.5/2.5
375-450; 4.0/3.0
450-550; 4.5/3.5
550-650; 5.0/3.5
650-800; ---/4.0
800-1000; ---/4.5
1000+++: ---/5.0
STRICTLY DAILY DRIVER- GO DOWN ONE SIZE
BIG NITROUS- USE ONE SIZE BIGGER
DO THOSE NUMBERS STAY THE SAME WHEN RUNNING STRAIGHT PIPES, OR WOULD THEY DECRESS A SIZE? I'M @ 420HP AND RUNNING 2.5" STRAIGHT PIPES.
Laughing Gas
Joined: Mar 2004
Posts: 1,243
Likes: 0
From: Maple Ridge B.C. Canada
im running dual 3 inch all the way from the headers to the dual 5 inch tail pipes,the engine is a 428scj (super cobra jet) multi port propane injected.it soundes real good and runs really strong.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The numbers would stay the same. The numbers are for racing applications so they show the numbers for circle track "full throttle" type applications. For other applications like towing take the numbers down one size like it says. In fact with a daily driver seeing mostly city traffic it would probably be advantageous to drop TWO sizes. Bigger is NOT better when it comes to exhaust systems or most other things on our trucks.
For 420HP dual pipe daily driver you would need 2.5" pipes. Straight pipes usually do not perform as well as running mufflers for some strange reason that I can't remember.
For good sound without killing your ears, waking the dead, or listening to the stereo try Magnaflow mufflers. They are much smoother at cruise speeds but growl real well when you open the throttle. Much better than Flowmasters which have an ugly harsh noise all the time.
For 420HP dual pipe daily driver you would need 2.5" pipes. Straight pipes usually do not perform as well as running mufflers for some strange reason that I can't remember.
For good sound without killing your ears, waking the dead, or listening to the stereo try Magnaflow mufflers. They are much smoother at cruise speeds but growl real well when you open the throttle. Much better than Flowmasters which have an ugly harsh noise all the time.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Probably a toss-up then. I have seen a lot of guys disconnect their pipes at the header flange, shove them aside, then use one bolt and a strap to hold the pipes up for racing. That way they can run a decent pipe for the street.
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Mike O.
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
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Mar 27, 2007 03:24 AM
