View Poll Results: Which Exhaust...
Single Straight pipe w/ Flowmasters
4
26.67%
Single WITHOUT straight pope w/ flowmasters
1
6.67%
Dual Straight pipe with flowmasters
8
53.33%
Dual WITHOUT Straight pipe w/ flowmasters
2
13.33%
Voters: 15. You may not vote on this poll
Getting Dual Exhast??
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 172
Likes: 0
From: U S of A
Getting Dual Exhast??
Opinions? Good Idea or not?
I want to get flowmaster mufflers.. that's definite, but should I gut the cat (or straight pipe) or should i leave the tree-saver on there? I know i could (more like would) lose back pressure, which means lost compression.....but how much could i be losing?
Any opininons are welcome
I even got me a poll for you guys to fill out
I want to get flowmaster mufflers.. that's definite, but should I gut the cat (or straight pipe) or should i leave the tree-saver on there? I know i could (more like would) lose back pressure, which means lost compression.....but how much could i be losing?
Any opininons are welcome
I even got me a poll for you guys to fill out
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
Getting Dual Exhast??
Backpressure and compression are in no way related. Backpressure should be kept to a minimum, but, some is required to keep exhaust velocity up, and scavenging at it's maximum, too little and you lose low end power, too much and you are losing power through the rev range.
How are you planning on running duals? Stock exh. manifold and a single/dual muffler? If so, go for the Flow, but, if you're gonna run true duals, a pair of Flows will sound like a pair of threes...
Evan
How are you planning on running duals? Stock exh. manifold and a single/dual muffler? If so, go for the Flow, but, if you're gonna run true duals, a pair of Flows will sound like a pair of threes...
Evan
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Getting Dual Exhast??
I have duals on my 300 now, with Dynomax mufflers, and it is anoyingly loud. The exhaust dumps to the side, in front of the right rear tire. I am going to replace this with a single 3", with a Dynomax muffler, all the way back out under the rear bumper. I have a 2" downpipe, and EFI manifolds. The difference in power between correct backpressure and none is phenominal- this same engine used to have headers with 3" collectors, and glasspacks, and made very little torque. Now it will pull a house down at an idle, and I am expecting a nice increase again from going to a single exhaust. What you do is your choice, but I think that you will be happier with a single exhaust, maybe 2.5" if the engine isn't that modified.
Elder User
Joined: Mar 2003
Posts: 628
Likes: 0
From: Colorado
Getting Dual Exhast??
I have a single 2-1/2" exhaust with a high flow cat and Flowmaster 40 (too loud for me). I just put on EFI exhaust manifolds & Walker downpipe. Coupled with a Holley 390 4bbl., the increase in power is phenomenal.
The smog pump eats about 1/4 H.P. & the new high flow cats are less restrictive than some mufflers ( see Project M.P.G.) - so I'd say that while you lose some power to clean air - it's nothing compared to other gains to be had with the 300. I can IDLE up 35* slopes in low range/granny - the torque actually improved, along with a 10 mph (top speed) gain on the freeway on ramp (approx. 1/4 mile). And that is at 6,000 feet - I wonder how it would do at sea level.
I went from stock (2-ish) to 2-1/2" single exhaust last Summer - with the stock intake & exhaust manifolds. The difference was NOTHING (maybe 5%) compared to the 4bbl/ intake/ EFI exhaust swap. I don't know what a desktop dyno would say to my mods, but I say WOW - it feels like DOUBLE the horsepower.
The smog pump eats about 1/4 H.P. & the new high flow cats are less restrictive than some mufflers ( see Project M.P.G.) - so I'd say that while you lose some power to clean air - it's nothing compared to other gains to be had with the 300. I can IDLE up 35* slopes in low range/granny - the torque actually improved, along with a 10 mph (top speed) gain on the freeway on ramp (approx. 1/4 mile). And that is at 6,000 feet - I wonder how it would do at sea level.
I went from stock (2-ish) to 2-1/2" single exhaust last Summer - with the stock intake & exhaust manifolds. The difference was NOTHING (maybe 5%) compared to the 4bbl/ intake/ EFI exhaust swap. I don't know what a desktop dyno would say to my mods, but I say WOW - it feels like DOUBLE the horsepower.
Elder User
Joined: Mar 2003
Posts: 628
Likes: 0
From: Colorado
Getting Dual Exhast??
Originally posted by 84f150guy
[
"tell me though.......i like mine a bit loud......is the 40 series a good tone?? [/B]
[
"tell me though.......i like mine a bit loud......is the 40 series a good tone?? [/B]
Postmaster
Joined: Feb 2003
Posts: 3,441
Likes: 5
From: Muskegon, MI (home)
Getting Dual Exhast??
I am running no cats through 2.5" tubing into a Flow-40 and out 2.25" duals straight out the back. Sounds mean at idle (V8 sound) I have had people thinking I had an 8 under the hood. Nice and throaty at idle, Diesel sounding while accelerating, sounds very mean under load! I love it!
