exhaust disappointing
Elder User
Joined: Dec 2003
Posts: 848
Likes: 3
From: Kokomo
Took my cats off the other day at 170,000 miles on a 4.6 in a crown vic, they were as clean as new! Very supprised, the sound is a crark deeper, but has a great muscler sound at 1\2 throttle that it did not have before, very happy, I took the rear cats off so I got no codes or anything, as long as the O2 sensor is in front of the cat that you are taking off you will have no problem, I disconnected the battery to reset the computer, I would recomend this to anyone, will be the first thing to go on my new SD.
Senior User
Joined: Jul 2003
Posts: 115
Likes: 0
From: N. E. Ohio
I spoke to engineers at Gibson and others about the V-10 exhaust. They all said the V-10 looses power when you start taking away back pressure. I have to agree with them after tuning Harleys on a dyno. The baddest sounding bikes usually were a dog unless they were at full throttle and wound out. The best HP gains we see usually are not with the loudest exhaust. Too many people think that if the exhaust sounds louder they automaticaly get more power.
Elder User
Joined: Aug 2002
Posts: 656
Likes: 0
From: South of you
My Gibson on my F-150 was really disappointing as well. I think it comes from California and they have to conform to their rules for sound...I guess. Well after a year and a little rust, I chopped the whole thing off, and just ran a 3" pipe from my cat back to a single factory exit. Don't bother with hacking off your cats, just hack off the muffler and straight pipe it. If you want dual outlets, any custom exhaust shop can handle this for you. Many wont delete the cat, but they will delete the muffler.
Elder User
Joined: Apr 2002
Posts: 541
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From: Paducah KY
Originally Posted by turboglide
I spoke to engineers at Gibson and others about the V-10 exhaust. They all said the V-10 looses power when you start taking away back pressure. I have to agree with them after tuning Harleys on a dyno. The baddest sounding bikes usually were a dog unless they were at full throttle and wound out. The best HP gains we see usually are not with the loudest exhaust. Too many people think that if the exhaust sounds louder they automaticaly get more power.
Senior User
Joined: Mar 2004
Posts: 285
Likes: 0
From: Mackville,VT
Removed my muffler yesterday to prepare for new system installed tommorow noticed instant throttle response compared to stock muffler. It sounds loud and simmular to a straight 6 with no exhaust deffinatley a head turner! I noticed the lack of backpressure especially when decellerating the motor does not commpression brake as much.
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Mountain Pass
Joined: May 2003
Posts: 107
Likes: 1
Since when does backpressure make more power? I thought the name of the game was to get a free flowing exhaust? When I went to super competition headers and full 3" exhaust/flowmasters on my ol '78 it got a lot more power and sounds great too. Is the V10 depending on some backpressure for a reason? I know if it flows more it may make the computer run things a little leaner to make up for over-scavenging of the exhaust. Traditionally a free flowing exhaust (with equal length tubes) would help pull more air into the head from the cam overlap (exhaust used to help pull intake charge in). I don't know if I want to bother taking the cat off and see if it's plugged. It doesn't look easy and the slip joint does not slip apart easy like some say it does. Any thoughts?
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