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Performance Exhaust SystemsDetailed discussions regarding performance headers, single, dual, street and off-hard racing exhaust systems for your vehicle.
This is a discussion thread titled "Efficient exhaust", within the Performance Exhaust Systems forum, part of the Technical & Vehicle Assistance Forums category.
From what I can tell the tundra has a pretty efficient exhaust system from the factory. If someone where to say put a flowmaster 40 muffler in the place of the stock one, would this affect the torque or horsepower in a negative way? I'd really like to install a single flowmaster muffler using the stock piping but with a turndown. I just really do not want to lose any power at all. I know I've posted about exhaust many times, but it seems I get confused over the basics. I appreciate any insight.
for power you just want as much flow as possible. however you do require a bit of backpressure from your exhaust. but with the hardcore catalytic converters on todays vehicles, to meet the ever increasing demand for clean burning engines. you could bolt a straight pipe to the back of the catalytic converter without fear of losing your backpressure.
but if its power you want, make sure you open up the intake too, if you open the exhaust. the ability to let more air out of the engine, is not much good without being able to take more air in.
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2007 Tundra LTD CrewMax, Black
2006 Chrysler 300 SRT8, Brilliant Black, Tinted Windows, Full Stereo, 22" wheels, Magnaflow hi-flo cats, Corsa cat-back exhaust, VORTECH SUPERCHARGED
SOMEGUY is right that the cats(4) create enough back pressure. does any one have some information on the best tail pipe to use? Zoomer uses a single 3" tail pipe(stock is 2-3/4". if you go to dual tail pipes is two 2-3/4 too big? why do some say two 2-1/4 are better?
I believe its about creating the most flow while retaining a bit of back pressure. The 3in is fine for a single outlet but way too much for dual. I wish I could find some definitave information of CFM flow rates on the different size tubes.
From experience, I can tell you that with the addition of the dual delta 40's ( 2 1/2 in tubes ) and the K&N drop in filter, my butt dyno said it was a good thing to do.
__________________ Black 2007 D/C Limited 4x4, seems to have ALL the options, Flowmaster Dual Delta 40's, K&N drop in filter,Rhino Liner' 3" frt 1" rear Daystar leveling kit, BFG Radial All Terrain TA's 305x65x18, Moto Metal M0951's in Chrome 18x9. Fully DeBadged , Stebel horn, Production date 8/07
all that is remaining is: AFE CAI, D.T. Headers
C.F. Dash kit, Black Mod Headlights, CW grill,
2000 BMW 323i 1997 Chevy Tahoe Sport 4x4
"Some people spend an entire lifetime wondering if they made a difference. The MARINES don't have that problem."
President Ronald Reagan 1985
SOMEGUY is right that the cats(4) create enough back pressure. does any one have some information on the best tail pipe to use? Zoomer uses a single 3" tail pipe(stock is 2-3/4". if you go to dual tail pipes is two 2-3/4 too big? why do some say two 2-1/4 are better?
personally i dont believe you will gain much power from exhaust. at least not without doing the cats. so i would be shooting strictly for sound. and corsa is known for their phenominal sound.
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2007 Tundra LTD CrewMax, Black
2006 Chrysler 300 SRT8, Brilliant Black, Tinted Windows, Full Stereo, 22" wheels, Magnaflow hi-flo cats, Corsa cat-back exhaust, VORTECH SUPERCHARGED
You will gain power, just keep in mind the 40's are going to be LOUD.
Ditto X 2 ( its such a NICE loud though )
__________________ Black 2007 D/C Limited 4x4, seems to have ALL the options, Flowmaster Dual Delta 40's, K&N drop in filter,Rhino Liner' 3" frt 1" rear Daystar leveling kit, BFG Radial All Terrain TA's 305x65x18, Moto Metal M0951's in Chrome 18x9. Fully DeBadged , Stebel horn, Production date 8/07
all that is remaining is: AFE CAI, D.T. Headers
C.F. Dash kit, Black Mod Headlights, CW grill,
2000 BMW 323i 1997 Chevy Tahoe Sport 4x4
"Some people spend an entire lifetime wondering if they made a difference. The MARINES don't have that problem."
President Ronald Reagan 1985
My friend has an old Flowmaster setup on his truck and it sounds like ***. Sounds nice at idle and even okay during driving. He even let me drive it for like 20 miles or so during the day and it was hard to get back into my truck with the Borla. However, when you get on it it sounds horrible. The only way I can describe it is a wall of sound. It just hits you. It's loud and has no tone at all. Granted, this is all on a '94 Chevy Silverado, but you get the picture. I'd have to listen to a lot of Flowmasters at full throttle to decide to get one. He has duals with one muffler. Not sure which Flowmaster it is exactly, never wanted/took the time to find out. It's so loud I can hear him from when he's coming down the street from inside my room. He doesn't even need to call me anymore to let me know he's here haha
With that said, I love my Borla. It sounds awesome through the entire RPM range. Very toned. If I had enough patience I might have gone with the Corsa but I like the rolled tips, instead of rectangular (They do have non-typical tips, right?).
To the OP, everybody is right - you need some backpressure to create torque. The smaller the pipes the more backpressure = torque. The bigger the pipes = less backpressure = better hp high end.
From what I can tell the tundra has a pretty efficient exhaust system from the factory. If someone where to say put a flowmaster 40 muffler in the place of the stock one, would this affect the torque or horsepower in a negative way? I'd really like to install a single flowmaster muffler using the stock piping but with a turndown. I just really do not want to lose any power at all. I know I've posted about exhaust many times, but it seems I get confused over the basics. I appreciate any insight.
I wouldn't think the factory exhaust is the least bit efficient, other than at reducing sound. With the engine idling, put your hand close to the tailpipe. Do you feel any exhaust pulses? I don't on mine, so to me, that means the factory exhaust is a big cork.
IMO, I think the factory intake is very free flowing and 90% + of any gains would come from a $50 free flowing filter element rather than a $350 + after market plastic air box. I say spend the money on exhaust first.
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'07 RCSB 5.7L SR5 Silver Sky Metallic (The Silver Bullet) Yep....it's gotta HEMI
Never argue with an idiot. They will bring you down to their level and beat you with experience!
My local muffler shop offer me custom set up with the flowmaster muffler and dual corsa tip for $500.00 sound good?It's own by 3rd generation muffler builders.For $500 custom sound good?
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2007 DC,Blue strike metallic,BBS rims,3rd ligth cover,x-sp,trd,calipers painted in blue.Chrome strips around the tailgate,,bug shield,wind deflectors.Side bed rails.G2 bakflip cover.TRD CAI,Alpine 2-1023d woofer,6x9 front dr,and 6x5 back dr speakers.1 Hifonics amp 4 channels,1-1000 wtts crunch amp for woofers.Dynamat all dr's,and back wall.Head ligths paint mod in black. Custom box 2 -10" woofers by Tech12volts.Chrome towing mirror covers,tail gate handle chrome cover,dr handle chrome cover.Billet grill top and bottom and bumper insert.Custom made dr sill's and dr pillar overlay by Billet technology.Stebel horn.More to come.
My local muffler shop offer me custom set up with the flowmaster muffler and dual corsa tip for $500.00 sound good?It's own by 3rd generation muffler builders.For $500 custom sound good?
I paid $200 for mine...They chipped my paint at the rear quarterpanel, cant even see it unless you know its there and reduced the price $50. So the original price for two series 40 delta flows and stainless 3 in tips INSTALLED was $250.
__________________ Black 2007 D/C Limited 4x4, seems to have ALL the options, Flowmaster Dual Delta 40's, K&N drop in filter,Rhino Liner' 3" frt 1" rear Daystar leveling kit, BFG Radial All Terrain TA's 305x65x18, Moto Metal M0951's in Chrome 18x9. Fully DeBadged , Stebel horn, Production date 8/07
all that is remaining is: AFE CAI, D.T. Headers
C.F. Dash kit, Black Mod Headlights, CW grill,
2000 BMW 323i 1997 Chevy Tahoe Sport 4x4
"Some people spend an entire lifetime wondering if they made a difference. The MARINES don't have that problem."
President Ronald Reagan 1985
To the OP, everybody is right - you need some backpressure to create torque. The smaller the pipes the more backpressure = torque. The bigger the pipes = less backpressure = better hp high end.
Good luck with what you choose.
-rockstate
Partially correct. Actually the back pressure is needed because a true free flowing exhaust with little back pressure tends to go through the rpm's quicker. (in and out of the engine quicker with all things being equal) Torque would be greater, but would get out of the torque ban quicker relying on hp to carry it on top end.(this would be after you played with the timing curve) Only way to compensate correctly is to make sure the timing curve kicks in quicker to keep up with the free flowing exhaust. Now we are talking tuner. But if there was a tuner and this could be compensated for, free flowing exhaust would be idea for more power all the way across the torque curve and hp curve. Keep in mind that gearing plays a big role in keeping the torque in check as well.
Your statement was correct, but only because there is currently not a way to play with the ignition timing curve.
Efficient exhaust
Linear Mode
