Exhaust Pipe Diameter - TundraTalk.net

TundraCA · 05-04-2008, 09:39 PM

Just wanted confirm before I purchased a muffler, the size of the pipe from the cats to the muffler is 2 1/2" correct?

blackbeaute · 05-04-2008, 11:15 PM

I measured 2.75

TundraCA · 05-04-2008, 11:29 PM

Quote:

Originally Posted by blackbeaute

I measured 2.75

Hmmmm, interesting. And that was from the pipe going from the last set of catalytic converters to the muffler inlet?

I'mSoBlue · 05-07-2008, 04:36 PM

Those 2 front pipes going to the muffler are 2 1/8". The tailpipe is 2 3/4"

TundraCA · 05-07-2008, 11:11 PM

Quote:

Originally Posted by I'mSoBlue

Those 2 front pipes going to the muffler are 2 1/8". The tailpipe is 2 3/4"

Hmmm. I'm just going to have to crawl under there and measure. Nobody makes a 2 1/8" muffler, from I've seen they are all 2 1/2" inlet sizes (Magnaflow, Flowmaster, Aero, etc).

DrLivingston1980 · 05-08-2008, 11:16 AM

Flowmaster makes a 2" inlet and 2.25" inlet. I'm sure there are other manufacturers that make them as well.

TX Tundra 07 · 05-08-2008, 02:02 PM

I am certain that mine was 2.5" through the cats, then was reduced to 2.25" between the cats and muffler. Then it was a single 2.75" exit out of the muffler.

TundraCA · 05-08-2008, 07:11 PM

Quote:

Originally Posted by TX Tundra 07

I am certain that mine was 2.5" through the cats, then was reduced to 2.25" between the cats and muffler. Then it was a single 2.75" exit out of the muffler.

The reason I ask is that I currently am running a straight pipe exhaust (no muffler) and it's too raspy at WOT for me.

In the past, I've liked Dynomax Bullet mufflers, but the smallest size they make is 2.5" - so I wanted to see if that would fit the existing pipe coming off the cats.

ProCharger · 05-09-2008, 01:52 AM

It sounds like you are wanting to keep the loud sound but deaden the noise to an engine sound correct? You might give SpinTech mufflers a look. They have some OUTSTANDING sound if you want to be able to hear the truck yet it deadens the sound to an exhaust tone. I personally have no experience with the dynomax but figured I would give ya some options.

Spin Tech Mufflers

I have ran the Pro-Street series and all I can say is WOW!! If you want a little more quiet the Sportsman Street XL might catch your eye.

Again, just throwing out options.

Brett

TundraCA · 05-09-2008, 11:02 AM

Quote:

Originally Posted by ProCharger

It sounds like you are wanting to keep the loud sound but deaden the noise to an engine sound correct? You might give SpinTech mufflers a look. They have some OUTSTANDING sound if you want to be able to hear the truck yet it deadens the sound to an exhaust tone. I personally have no experience with the dynomax but figured I would give ya some options.

Spin Tech Mufflers

I have ran the Pro-Street series and all I can say is WOW!! If you want a little more quiet the Sportsman Street XL might catch your eye.

Again, just throwing out options.

Brett

Yes, that's what I'm looking to do. At wide open throttle, the exhaust note changes from deep, to a high pitched crackle. I don't like it. I had another truck that did this (that was straight piped), and I put a Dynomax bullet on it and it was perfect.

I'll check out the Spintech - thank you.

TundraCA · 05-09-2008, 11:09 AM

I just checked out the Spintech site. I've heard good things about them, but I can't find a dual in/single out muffler. I really don't want to put a y-pipe on my truck.

My idea was this, run (2) 14" Dynomax Bullet mufflers (one on each pipe from the cats-back) so I maintain the true dual setup. I was going to dump the tips underneath the truck, probably right underneath the cab. I know it will be loud, but less exhaust pipe = more efficiency.

I can't think of a more efficient setup than maintaining the dual exhaust and reducing the length of the system, while using a high flow muffler.

djb383 · 05-09-2008, 04:11 PM

Have you thought about running 2 of these? Straight thru, lifetime warranty, about $105/ea at Summit or Jegs.

MagnaFlow Performance Exhaust

ramoine · 05-09-2008, 04:38 PM

I just had a Flo~Pro muffler installed and it souds good . model # FP744 CENTER/DUAL-3" IN/2.25" OUT

Here is a link to the souds for most of their mufflers .

Performance Exhaust

TundraCA · 05-09-2008, 05:16 PM

Quote:

Originally Posted by djb383

Have you thought about running 2 of these? Straight thru, lifetime warranty, about $105/ea at Summit or Jegs.

MagnaFlow Performance Exhaust

Yeah, I had a Magnaflow setup before this one, it was too quiet for me.

bjowett · 05-09-2008, 09:43 PM

The pipes jump back to 2.35" just before entering the muffler.... that happens to be the same size that a slip to fit 2.25" muffler inlet will have. Two 6" peices of 2.25" pipe would bring it together well - you'll be able to keep the stock hangers in front of the muffler.

More info on the stock system....

The stock system is well designed for what it is. Toyota took care to slowly step down the tube size throughout the system to help keep the velocity up and probably reduce noise some. It runs tight off the header, maybe 2.12"? Then jumps to 2.50" to the first converter, then drops to 2.40" out of there, keeps that diameter though the second converter all the way to flanges where the rear exhaust bolts on (just aft the transfer case). The exhaust then drops to 2.12 into the muffler, then 2.75 out to the tailpipe. A better example may be tube ID area in sq in.

3.14" x 2 = 6.28"
4.45" x 2 = 8.9"
4.08" x 2 = 8.16"
3.14" x 2 = 6.28"
muffler not free flow, exhaust must pass through perforations
tailpipe = 5.43"

05-04-2008, 09:39 PM	#1 (permalink)
TundraCA Member Join Date: May 2008 Posts: 43	Exhaust Pipe Diameter Just wanted confirm before I purchased a muffler, the size of the pipe from the cats to the muffler is 2 1/2" correct?

05-08-2008, 11:16 AM	#6 (permalink)
DrLivingston1980 Senior Member Join Date: Apr 2008 Location: Maryland Posts: 114	Flowmaster makes a 2" inlet and 2.25" inlet. I'm sure there are other manufacturers that make them as well. __________________ 2008 Tundra 5.7L DC TRD/Silver Sky Metallic/SR5 4x4 <a href="http://www.youtube.com/watch?v=Dq20UMZvSSw&eurl=http://www.tundraheadquarters.com/blog/tundra-57-sound-clip-videos/">Flowmaster Super 40</a> Straight Back Dual Exhaust System<br> Herculiner Bed Liner<br>aFe Stage 2 CAI Pro-Dry S Filter w/aFe Mod<br> SteelCraft SS Step Bars<br>3" Rough Country Lvl kit w/1" Toytec rear blocks<br>CarriageWorks 5pc Billet Grille<br><br>

05-08-2008, 02:02 PM	#7 (permalink)
TX Tundra 07 Member Join Date: Aug 2007 Location: Weatherford, TX Posts: 84	I am certain that mine was 2.5" through the cats, then was reduced to 2.25" between the cats and muffler. Then it was a single 2.75" exit out of the muffler. __________________ Mine: 2007 Tundra Double Cab, 5.7L, slate, 2x4, Flowmaster 50 series dual in/dual out, Homemade leveling kit (2.5") Hers: 2007 Tundra Double Cab, TRD 2x4, 4.7L, desert sand Previous Vehicles: 1990 Jeep Wrangler Islander, Rancho Lift 1992 Chevrolet Silverado Z71 4x4 RCSB - 190,000 miles and still running strong when I sold it. 2001 Honda Magna VF750C 2002 Chevrolet Tahoe Z71 2006 Chevrolet Trailblazer SS (8.9 sec 1/8 mile - STOCK)

05-09-2008, 01:52 AM	#9 (permalink)
ProCharger Member Join Date: Apr 2008 Location: St. Louis Posts: 42	It sounds like you are wanting to keep the loud sound but deaden the noise to an engine sound correct? You might give SpinTech mufflers a look. They have some OUTSTANDING sound if you want to be able to hear the truck yet it deadens the sound to an exhaust tone. I personally have no experience with the dynomax but figured I would give ya some options. Spin Tech Mufflers I have ran the Pro-Street series and all I can say is WOW!! If you want a little more quiet the Sportsman Street XL might catch your eye. Again, just throwing out options. Brett __________________ 07 DC Limited 4x4 TRD Tundra 00 S-10 Xtreme Race Truck

05-09-2008, 11:09 AM	#11 (permalink)
TundraCA Member Join Date: May 2008 Posts: 43	I just checked out the Spintech site. I've heard good things about them, but I can't find a dual in/single out muffler. I really don't want to put a y-pipe on my truck. My idea was this, run (2) 14" Dynomax Bullet mufflers (one on each pipe from the cats-back) so I maintain the true dual setup. I was going to dump the tips underneath the truck, probably right underneath the cab. I know it will be loud, but less exhaust pipe = more efficiency. I can't think of a more efficient setup than maintaining the dual exhaust and reducing the length of the system, while using a high flow muffler. __________________ 2007 DC Tundra 5.7L TRD Package Blue Streak Metallic Straight pipe exhaust Intake mod Tint all the way around Readylift Leveling Kit

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05-04-2008, 11:15 PM	#2 (permalink)
blackbeaute Junior Member Join Date: May 2008 Posts: 1	I measured 2.75

05-07-2008, 04:36 PM	#4 (permalink)
I'mSoBlue Junior Member Join Date: Sep 2007 Posts: 4	Those 2 front pipes going to the muffler are 2 1/8". The tailpipe is 2 3/4"

05-09-2008, 04:11 PM	#12 (permalink)
djb383 Senior Member Join Date: Nov 2007 Location: Midland, The Republic of Texas Posts: 225	Have you thought about running 2 of these? Straight thru, lifetime warranty, about $105/ea at Summit or Jegs. MagnaFlow Performance Exhaust __________________ '07 RCSB 5.7 SR5 The Silver Bullet.........Yep, it's gotta HEMI

05-09-2008, 04:38 PM	#13 (permalink)
ramoine Senior Member Join Date: Jan 2008 Location: Huntington,Indiana Posts: 4,613	I just had a Flo~Pro muffler installed and it souds good . model # FP744 CENTER/DUAL-3" IN/2.25" OUT Here is a link to the souds for most of their mufflers . Performance Exhaust __________________ 2008 Crewmax X-SP carbon Fiber Dash kit 20" JTI Rims BFG AT KO 285/55/20 AFE C.A.I w/ Dry Pro filter and the AFE Mod Blacked out Headlight Mod. Flo~Pro muffler #744 Toytec 3" front , 1" rear blocks and Diff. lowering kit Last edited by ramoine : 05-09-2008 at 04:53 PM.

05-09-2008, 09:43 PM	#15 (permalink)
bjowett Member Join Date: Apr 2008 Posts: 44	The pipes jump back to 2.35" just before entering the muffler.... that happens to be the same size that a slip to fit 2.25" muffler inlet will have. Two 6" peices of 2.25" pipe would bring it together well - you'll be able to keep the stock hangers in front of the muffler. More info on the stock system.... The stock system is well designed for what it is. Toyota took care to slowly step down the tube size throughout the system to help keep the velocity up and probably reduce noise some. It runs tight off the header, maybe 2.12"? Then jumps to 2.50" to the first converter, then drops to 2.40" out of there, keeps that diameter though the second converter all the way to flanges where the rear exhaust bolts on (just aft the transfer case). The exhaust then drops to 2.12 into the muffler, then 2.75 out to the tailpipe. A better example may be tube ID area in sq in. 3.14" x 2 = 6.28" 4.45" x 2 = 8.9" 4.08" x 2 = 8.16" 3.14" x 2 = 6.28" muffler not free flow, exhaust must pass through perforations tailpipe = 5.43"

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