Baffles - ruining the motor
Road Master
Joined: Nov 2006
Posts: 1,164
Likes: 401
From: Port Coquitlam B.C.
Anyone who says back pressure is a myth has never tried driving a car with open headers down to the muffler shop. They don't run worth a crap. You have to rev the sh*t out of it to keep it running. Once the mufflers are on it's goes back to running right. Back pressure must be doing something.
Road Captain
Joined: Aug 2009
Posts: 526
Likes: 4
From: North Atlanta Georgia
Hogwash to ruining your engine fast or slow if you run without baffles as long as you jet/remap properly. Saying you will is misleading and is only part of the story.
Losing some low end is true, but you will also pick a little hp on the top end.
I've don't think racing bikes, cars, or boats run anything other than straight tuned pipes with no baffles. Maybe some superbikes do, don't know. Think about itthough.
For the record, I don't run straight pipes.
Losing some low end is true, but you will also pick a little hp on the top end.
I've don't think racing bikes, cars, or boats run anything other than straight tuned pipes with no baffles. Maybe some superbikes do, don't know. Think about itthough.
For the record, I don't run straight pipes.
Tourer
Joined: Apr 2008
Posts: 289
Likes: 0
From: GLOBE AZ..
Anyone who says back pressure is a myth has never tried driving a car with open headers down to the muffler shop. They don't run worth a crap. You have to rev the sh*t out of it to keep it running. Once the mufflers are on it's goes back to running right. Back pressure must be doing something.
Grendal Your Dead On
Banned
Joined: Mar 2010
Posts: 5,403
Likes: 7
From: Southwest Florida
Anyone who says back pressure is a myth has never tried driving a car with open headers down to the muffler shop. They don't run worth a crap. You have to rev the sh*t out of it to keep it running. Once the mufflers are on it's goes back to running right. Back pressure must be doing something.
If you watch drag races, or almost any other kinds of professional racing, those cars run little to no pipes. If you look at the Harley/V&H NHRA Pro Stock Champion bike, you'll see dual pipes about a foot long. That bike idles like crap too. And you have to rev it to keep it running, too.
If your example car could turn 10,000 RPM, it would run fine with no exhaust system and just headers at ten grand. But don't try that, you won't like what happens.
We don't live in that world. We don't leave stop lights at 5,000 RPM and power shift at 9,500 RPM. We also don't chug along like a Mack Diesel turning 1,500 RPM most of the day. So we have to find and use exhaust systems that work in a variety of situations.
For us, there is no such thing as a perfect solution. It just doesn't exist. Drag pipes work fine at lower RPM but they're done at 4,000 RPM. Done. Restrictive systems work fine at about the same RPM range. More open 2 into 2 systems lose some torque at lower RPM but seriously come to life in the higher ranges. 2 into 1 systems are probably the best compromise of all of them but even THEY aren't perfect.
There's no such thing as perfect for us. Only personal prefences.
Supporter
Joined: Jan 2007
Posts: 15,788
Likes: 5,625
From: along the shore of Mishigami
The exhaust pulse also helps scavenge the exhaust from the exhuast port/valve area. My question what is the word "ruin" meaning? Is it going to pysically damage (ruin) the engine. Or the performance of the engine will be degraded (performanced ruin), yea sounds goofy. But go back to your source and ask in what aspect does he mean ruin.
Seasoned HDF Member
Joined: Jul 2008
Posts: 9,282
Likes: 1,139
From: southeast PA
Dude, hopefully it's ok I call you dude, check out this thread on our site:
https://www.hdforums.com/forum/dyna-...ffler-mod.html
Removing the stock/SE baffles and replace with Cycle Shack baffles. Not sure what your muffs look like on your '04, but they'd probably fit. A lot of other people did the same mod with great success. Louder and still the whole "back pressure" thing.
I'm doing this in the coming weeks.
https://www.hdforums.com/forum/dyna-...ffler-mod.html
Removing the stock/SE baffles and replace with Cycle Shack baffles. Not sure what your muffs look like on your '04, but they'd probably fit. A lot of other people did the same mod with great success. Louder and still the whole "back pressure" thing.
I'm doing this in the coming weeks.
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