4.9 Exhaust
Thread Starter
|
New User
Joined: Oct 2004
Posts: 13
Likes: 0
From: Chicago
4.9 Exhaust
I've got a '91 F150 that lost the exhaust from the cat back. It's running straght off the cat right now, which doesnt sound too bad in the lower rpm range, around 2000 down. Above that it sounds like a cow mooing. Shouldn't sound like that, it's not a cow. I'm wondering if a longer glasspack would make it sound less bovine, with a pipe exiting in front of the rear wheel, or just run a pipe from the cat back, again exiting in front of the rear wheel. I haven't messed with an exhaust in quite a while, I'd like to keep the lower rumble without it sounding the way it does now. Any help would really be appreciated!
Tolak
Tolak
Posting Guru
Joined: Nov 2003
Posts: 1,858
Likes: 1
From: Dark side of the sun.
No muffler wont hurt it,if any it'll help. But the same thing happened to me,If your state has no emisions,just run a pipe back,but if you do just do what I did and put a racing muffler on,which if its like mine,is just a chamber with a "V-Plate" in the middle. you keep the sound,only its quieter. but if you want the throaty sound,replace the stock cats with a high flow since you need exhaust work. You'll get better performance and sound better. (at the lower RPM range.)
New User
Joined: Feb 2005
Posts: 19
Likes: 0
From: Ft Worth, Texas
Beating the Bovine with dual pipes and a flowmaster
Hey I got a ’88 F-150 that had the same problem. My push lawn mower had better exhaust then my truck. Anyways, I took mine into the exhaust shop and found that catalytic converters were the problem. High mileage motors that still contain the original catalytic converters have a problem with clogging. Inline six motors have two catalytic converters in line with each other since there is only one exhaust manifold. On mine, the first catalytic converter was completely empty. It had dumped all its packing into the second one. I had it removed and installed a high flow catalytic converter. I had a dual-exit Flowmaster 50 series truck muffler installed and ran duel chrome tips out the back. My truck sounds so much better now, plus it looks good too. People still don’t believe that it’s a six cylinder when I start it up. At idle it sounds like a mild V8 motor, even though on the highway its still relatively quiet you can feel and sometimes hear the sound coming into the cab. I am very pleased with the results. Mileage has stayed about the same and the truck has much better throttle response and off-the-line acceleration than it used to. The engine revs through the rpms a lot quicker than before now that it can breathe better out the back. Any questions, just let me know.
P.S. don't recommend running without mufflers. they are illegal, nice traffic fines await you if you take them off and get caught. without pipes a straight six will roar like a stock car on race day. cool to hear till a cop hears you. just a little fyi.
P.S. don't recommend running without mufflers. they are illegal, nice traffic fines await you if you take them off and get caught. without pipes a straight six will roar like a stock car on race day. cool to hear till a cop hears you. just a little fyi.
Thread
Thread Starter
Forum
Replies
Last Post
