straight pipe on 04-06
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From: E.C. Wisconsin
???'s about straight pipe on 04-06
Has anybody on here seen, heard, or done themselves a straight pipe/ D.O. exhaust system on a 04-06 5.4. I've searched for this but never found any definite answers. I had this set-up on a 98 SCAB 4.6L, D.O. rear exit and it sounded great. Wasn't obnoxious loud unless I really tried to make it. No cabin drone like many of you are complaining about. All the sound went out the back.
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
Last edited by hmfic; Oct 13, 2005 at 01:54 PM.
Originally Posted by hmfic
ANYBODY?? PRETTY QUIET OUT THERE.. 70 VIEWS SO FAR, NO REPLIES. I WAS THINKING ABOUT GETTING THIS DONE, BUT DON'T WANT TO MAKE A MISTAKE.. 
If you liked it on your truck, then do it. Where Im from you have to have some kind of muffler so you might want to check the law books.
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From: CENTRAL IOWA
Originally Posted by hmfic
Has anybody on here seen, heard, or done themselves a straight pipe/ D.O. exhaust system on a 04-06 5.4. I've searched for this but never found any definite answers. I had this set-up on a 98 SCAB 4.6L, D.O. rear exit and it sounded great. Wasn't obnoxious loud unless I really tried to make it. No cabin drone like many of you are complaining about. All the sound went out the back.
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
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Normally an 18 inch piece of pipe is plenty to stop cold air from sucking back into the hot exhaust valves.
Backpressure itself is not a requirement on 4 cycle engines.
Now if you over scavenge, you might loose a little on the bottom end, but I've gone with a very minimal exhaust and the power was great.
Several have posted that they are running straight pipes, no muffler, and results are very good, so noise considerations aside, a straight pipe from the back cats to past the passenger compartment would probably work fine.
Chris
Backpressure itself is not a requirement on 4 cycle engines.
Now if you over scavenge, you might loose a little on the bottom end, but I've gone with a very minimal exhaust and the power was great.
Several have posted that they are running straight pipes, no muffler, and results are very good, so noise considerations aside, a straight pipe from the back cats to past the passenger compartment would probably work fine.
Chris
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From: Greenville, SC
Originally Posted by hmfic
Has anybody on here seen, heard, or done themselves a straight pipe/ D.O. exhaust system on a 04-06 5.4. I've searched for this but never found any definite answers. I had this set-up on a 98 SCAB 4.6L, D.O. rear exit and it sounded great. Wasn't obnoxious loud unless I really tried to make it. No cabin drone like many of you are complaining about. All the sound went out the back.
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
Actually saw a mpg and seat of pants increase. There seemed to plenty of back pressure, but I did have a local shop bend the pipes, not sure if that casued it. A friend of mine had the same setup only he just kept the stock piping and put in a straight pipe, didn't sound that good. Any thought or ideas?
Wisconsin Statutes
347.39 Mufflers.
(1) No person shall operate on a highway any motor vehicle subject to registration unless such motor vehicle is equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise or annoying smoke. This subsection also applies to motor bicycles.
(2) No muffler or exhaust system on any vehicle mentioned in sub. (1) shall be equipped with a cutout, bypass or similar device nor shall there be installed in the exhaust system of any such vehicle any device to ignite exhaust gases so as to produce flame within or without the exhaust system. No person shall modify the exhaust system of any such motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all the requirements of this section.
(3) In this section, "muffler" means a device consisting of a series of chambers of baffle plates or other mechanical design for receiving exhaust gases from an internal combustion engine and which is effective in reducing noise.
347.50 Penalties.
(1) Any person violating ss. 347.35 to 347.49, except s. 347.413 (1) or s. 347.415 (1m), (2) and (3) to (5) or s. 347.417 (1) or s. 347.475 or s. 347.48 (2m) or (4) (a) or s. 347.489, may be required to forfeit not less than $10 nor more than $200.
347.39 Mufflers.
(1) No person shall operate on a highway any motor vehicle subject to registration unless such motor vehicle is equipped with an adequate muffler in constant operation and properly maintained to prevent any excessive or unusual noise or annoying smoke. This subsection also applies to motor bicycles.
(2) No muffler or exhaust system on any vehicle mentioned in sub. (1) shall be equipped with a cutout, bypass or similar device nor shall there be installed in the exhaust system of any such vehicle any device to ignite exhaust gases so as to produce flame within or without the exhaust system. No person shall modify the exhaust system of any such motor vehicle in a manner which will amplify or increase the noise emitted by the motor of such vehicle above that emitted by the muffler originally installed on the vehicle, and such original muffler shall comply with all the requirements of this section.
(3) In this section, "muffler" means a device consisting of a series of chambers of baffle plates or other mechanical design for receiving exhaust gases from an internal combustion engine and which is effective in reducing noise.
347.50 Penalties.
(1) Any person violating ss. 347.35 to 347.49, except s. 347.413 (1) or s. 347.415 (1m), (2) and (3) to (5) or s. 347.417 (1) or s. 347.475 or s. 347.48 (2m) or (4) (a) or s. 347.489, may be required to forfeit not less than $10 nor more than $200.
In Wisconsin, any exhaust that is louder than the original exhaust can be cause for a fine. Of course, police officers and highway patrolmen generally use their discretion when enforcing such a statute. Whether straight pipes will draw any attention at all, or any more than a aftermarket exhaust system, I cannot say. What I can tell you is that, under Wisconsin law, you can be fined for having straight pipes (unless your straight pipes are somehow less loud than the original exhaust on the vehicle). I don't have inclinations either way. I'm just offering a "heads up".
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From: E.C. Wisconsin
Well according to that, magnaflow and flowmasters are out of the question then too. Ive ran the straight pipes in WI before, they are not nearly as loud as these neon rice racers we have an abundance of.
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From: Greenville, SC
Originally Posted by hmfic
Well according to that, magnaflow and flowmasters are out of the question then too. Ive ran the straight pipes in WI before, they are not nearly as loud as these neon rice racers we have an abundance of.
Keep in mind, though, that with this statute in place, a loud muffler can be sufficient probable cause to stop a driver of a vehicle. It's something you might want to consider the next time you're a little tipsy and decide to drive, or when you've decided to traffic something that is otherwise illegal. That's one major defense (and often times, the best defense) to a search and seizure - a pretextual stop - right out the window.
Last edited by minus_13; Oct 14, 2005 at 02:22 PM.
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From: in a van down by the river
Just had my truck dualed out and straight piped from the cats back today.....Gotta say its way way louder than my last 4.6. I liked the sound of the 4.6 much better. The new one has alot of kackle where as my last truck was more of a low nice tone. Im going to throw a muffler of some sort to tone it down. Sounds good if you like kackle though. People will know your around when u get on it.
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From: North Alabama
Originally Posted by Redneck911
I, personally, think it would be a mistake. Some rednecks think the best things in the world are stright pipes and mud tires on the back with dual anntenas for their CB's.
If you liked it on your truck, then do it. Where Im from you have to have some kind of muffler so you might want to check the law books.
If you liked it on your truck, then do it. Where Im from you have to have some kind of muffler so you might want to check the law books.
Edit: btw if you have to have a muffler you can get glasspack and hollow it out. it still looks like you have a muffler on but its really just a empty pipe
Last edited by Justins FX4; Oct 15, 2005 at 06:07 PM.
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Originally Posted by Justins FX4
snip
Edit: btw if you have to have a muffler you can get glasspack and hollow it out. it still looks like you have a muffler on but its really just a empty pipe
Edit: btw if you have to have a muffler you can get glasspack and hollow it out. it still looks like you have a muffler on but its really just a empty pipe
If a cop stops you, it doesn't matter if you have a dozen mufflers or none, it's based on sound, so a visible 'fix' won't do the trick.
Got a lot of friends that have tried...
A cheap MagnaFlow with a straight shot through is a pretty good compromise.
Chris
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From: E.C. Wisconsin
Originally Posted by ChrisAdams
A cheap MagnaFlow with a straight shot through is a pretty good compromise.
Chris
