Strings

I have a 1994 3.0 4x4 Pickup and I am going to put a high flow cat and flowmaster delta 40 on it. My question is what size exhaust 2-1/2 or 2-1/4. The truck is all stock but i might put on A K&N intake some day.

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mikes19984x4

if you're gonna replace all the stock pipe, go with the 2.5-inch...and also check into some aftermarket headers, as that'll open things up a bit...

__________________
1998 4Runner SR5 4x4
3.4 w/5-speed & E-Locker
Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
More mods to come...

Strings

Thanks for the imput. I would LOVE to have headers but this is my first viehicle and headers aren't quite in the budget. But I think the 2.5 is sounding pretty good.

Jay351

I would personally stick with a 2.25" The 3.0 doesnt flow enough to justify a 2.5" pipe size.

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91 Pickup - xcab - 5sp - 3.0 - SR5 - 4x4 - 246,000kms |2.25" catback w/ magnaflow cat + glasspack | Weasy2k cams | Aisin manual hubs | Diff breather mod| Marlin HD clutch |3" BL | es3000's |2" AAL |1.5" bj spacers | ISR | Alpine headunit | 4" Infinity fronts/5" rears | 4.88's |Rear lockright | 33x12.50" BFG M/T on 15x8" steelies |Hella 500's |4" reverse lights| Grant GT |Downey idler arm brace|hella E-codes| Marlin armor | %100 Amsoil synthetic


http://www.cardomain.com/ride/2572486

ks_yota

is our stock pipe 2.25 or just 2?

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89 3.0 Ext Cab

desertyodaboy

I would go with 2.25.....I just did mine to a magnaflow and stuck with 2.25 all the way through

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99' Tacoma Trd V6 4x4, TRD exhaust, supercharger, 2.5" SAW coilovers in front, Bilsteins 5100s in rear, 32" Goodyear wrangler MTRs on 15" welds, HID lights on custom bumbers Ivan stewart TRD decals and red top Optima...GONE

CURRENT

20004runner Limited 4x4 3.4
265/75/16 Cooper Discoverer S/T
14" Magnaflow
Gray Wire Mod
Deckplate Mod
DR CO, TC UCA and PP Coils with Bilsteins

85 2wd Toyota p/u Stock
85 4runner Stock for now

http://s215.photobucket.com/albums/cc7/desertyodaboy/

RobD

Did the 3.4 swap and had custom exhaust built from the manifolds back. Muffler shop said that 2.25" is fine for the V6 and that anything bigger wasn't really worth the investment.

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1991 4Runner, 3.4 5VZFE swap, OME shocks/springs, 33" BFG All Terrain T/A KOs, Pioneer head unit, Infinity speakers, XM Satellite radio

Jay351

Stock size is 2 1/8th very odd size.

the only v6 that would need 2.5 is the 3.4, even then only if you have some goodies under the hood.

__________________
91 Pickup - xcab - 5sp - 3.0 - SR5 - 4x4 - 246,000kms |2.25" catback w/ magnaflow cat + glasspack | Weasy2k cams | Aisin manual hubs | Diff breather mod| Marlin HD clutch |3" BL | es3000's |2" AAL |1.5" bj spacers | ISR | Alpine headunit | 4" Infinity fronts/5" rears | 4.88's |Rear lockright | 33x12.50" BFG M/T on 15x8" steelies |Hella 500's |4" reverse lights| Grant GT |Downey idler arm brace|hella E-codes| Marlin armor | %100 Amsoil synthetic


http://www.cardomain.com/ride/2572486

87TurboYota

I concur with the majority 2 1/4 is the way to go.

__________________
Aaron

1989 Ford Probe GL 2.2L, 4 cly. ~240K
1991 Toyota Truck Extended Cab, 22RE, 30'' BFG ATs, 5 spd, 183K SOLD!!
1987 Toyota Pickup std. cab, 22ret, 31'' BFG ATs, 5 spd. , 155K SOLD!!

Pictures
http://community.webshots.com/user/volsg8rh8r

CoedNaked

2 1/8" is the stock size, the bends on the stock pipe are about 1 7/8" due to the crush bending. So 2 1/4" will have more volume, and have bends that are around 2" from crush bending which will improve flow coupled with a 2 1/4" free-er flowing muffler.

The best exhaust size for the 3vze would be mandrel bent 2 1/8" but good luck finding an exhaust shop with a mandrel bender (theres one in my province I believe, mind you it's right near my house) and to make matters worse you would have had some divine intervention if you managed to find an exhaust shop with not just a mandrel bender, but also the 2 1/8" dies to mandrel bend pipe coupled with stocking 2 1/8" exhaust tube (which can be found, but it's slightly more expensive because it's an exotic size).

I have a Borla catback and it is 2" mandrel bent and I'd say if you want a bit more torque it's a sweet set up.

__________________
1993 Xtra Cab Pickup | 4x4 | 3.0 - V6 | R150F | Silver-Grey | Amsoil 10w30 synthetic oil | Amsoil Synthetic Drivetrain fluids|
Borla Cat-back Exhaust | OME HD Leaf Springs | Bilstein HD Shocks | Downey Idler Arm Brace | Grey Husky Liners | SR5 Bucket Seat Swap | Color matched Canopy | Yakima racks | Line-X OTR | Michelin LTX A/T 31 x 10.5 x 15 | 323,600 KM's (202,250 miles) | Made in Japan - Vin starts with "J"| Fish on

stormin94

I've got 2.5" on my 3.0, and I love it. I guess what ever one is the better deal between the 2.25" and the 2.5". 2.5" isn't gonna kill yer rig. Hell, someone I used to know used to have a 3.0" exhaust from the headers back on the 3.0. Now that was a little much.

__________________

Future Mods
12V Aux outlet-400/800peak inverter
roof basket/lights
Air locker
4.88 gears
H.O. Alternator

Strings

So I guess majority rules and my yota will be getting a 2.25 exhaust! I can't wait as soon as i'm done painting it the exhaust is going on. Thanks for all the help.

RC000E

Just so I can establish the mentality on this site, I've got a question for everyone.

How many people believe that, cut and dry, smaller pipe=more backpressure=more torque, larger pipe=less backpressure=lower torque?

How many people believe that backpressure is what creates torque?

How many of you, say "in order to have torque, you have to have backpressure"?

__________________
1988 SR5, 3.0, 5spd, 35" BFG A/T's on alloy wheels, 4.5" Suspension lift, Pro Comp ProRunner bumper bar, modified Surco rack (lowered 1" and light mounting added), 4 Baja 55w Driving lights, 2 Hella 500's, Bushwacker flares, and Warn Hubs...more comin.

Custom turbo manifold fabrication, professional engine management tuning, custom engine management tuning solutions, head porting, engine building/blueprinting

CoedNaked

I believe nothing of the sort, at least relating to the explanation you put forth. Back pressure is one of the most commonly mis-used terms on auto discussion forums.

I believe that your engines exhaust size relative to your RPM's and desired performance is determined by volume. For exhaust pulses to flow properly, they need to stay hot. To keep exhaust pulses hot you have to have the right size exhaust. If your exhaust pipes are too large, your exhaust pulses cool which slows the flow of exhaust and causes the engine to have to work harder to push against that cooled exhaust soaking up power. This is one reason why guys who run pipes on the larger size of the spectrum for a particular engine will notice lost torque down low, because there aren't as many revolutions of the crank shaft which means less exhaust pulses, which means cooled exhaust, but when they rev the piss out of it, there are much more exhaust pulses which heats up the pipes and you get High RPM performance. There may not be one perfect exhaust size to cover your entire power band of your engine to have good power and torque at all RPM's, but I do believe there is one size that will satisfy most.

Another thing that influences performance is turbulence. An exhaust pulse is exactly that, a pulse of exhaust. In behind every exhaust pulse is an area of negative pressure, sort of like a vacuum. This vacuum pulls on the exhaust pulse behind it. This phenomenon is called scavenging. At a certain RPM's, your engines scavenging effect is so great that (read, efficiency!) that exhaust pulses passing by exhaust valves help pull other exhaust pulses out of the more downstream cylinder. When you start crush bending pipe so that you have bends that are smaller than the diameter of the straight pipe, you create turbulence of these exhaust pulses as opposed to mandrel bending which has consistent size in both the bends and straight sections.

Generally speaking I think you're going to find that smaller pipes will offer you better low end torque, and larger pipes will offer you higher RPM horsepower.

__________________
1993 Xtra Cab Pickup | 4x4 | 3.0 - V6 | R150F | Silver-Grey | Amsoil 10w30 synthetic oil | Amsoil Synthetic Drivetrain fluids|
Borla Cat-back Exhaust | OME HD Leaf Springs | Bilstein HD Shocks | Downey Idler Arm Brace | Grey Husky Liners | SR5 Bucket Seat Swap | Color matched Canopy | Yakima racks | Line-X OTR | Michelin LTX A/T 31 x 10.5 x 15 | 323,600 KM's (202,250 miles) | Made in Japan - Vin starts with "J"| Fish on

881stGenRunner

heres a good read - http://www.geocities.com/MotorCity/7...usttheory.html

__________________
-Brandon
1988 4Runner SR5 4x4 V6 5 Speed Swap (R150F)~SDORI 1.5" BJ Spacers~Downey 26MM TBs~Downey 3" Springs~Downey Shackles~PC ES3000s~PC ES2000 SS~Motive Gear 5.29s~Rear Detroit~Front Lock-Rite~Yakima Load Warrior~33x12.5 Pro Comp M/Ts~Cragar 15x8 Streetlocks~Cobra 18 WXSTII~Marlin Crawler Rear~Addicted Offroad Front Bumper~4X Innovations Sliders~WabFab Bikini Kit~Optima Yellow Top~SS IFS Truss.
My 4Runner and Other Stuff

reyna12

Hey-

I've got a 2.25" magnaflow cat and a 2.25" flowmaster super 40 with a 3" turndown right after the muffler. My 2.25" tubing starts about 1 foot before the cat.

If you want a loud deep rumble, then i'd go with a similar setup. Every time i drive through a parking structure i set off car alarms. Even driving through the neighborhoods here i set off alarms. I love it!

just my 2¢

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just my 2¢

If you have it, you wont need it. If you need it, you wont have it.

1994 3VZE Manual 4x4 X-Cab
31x10.50s 15x8 black Pacer Soft 8's
Pro Comp AAL, Intake
Custom 2.25" exhaust with Magnaflow Cat and Flowmaster Super 40 turndown

mikes19984x4

i'm gonna call bs on that one...i mean, really, a 3VZE setting off car alarms b/c of it's "rumble"...

__________________
1998 4Runner SR5 4x4
3.4 w/5-speed & E-Locker
Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
More mods to come...

reyna12

100 percent no lie! (why would i lie about it?)

the flowmaster super 40 muffler has great sound and with the 3" donkey d*ck right afterwards it sounds so deep, healthy, and clean.

__________________
just my 2¢

If you have it, you wont need it. If you need it, you wont have it.

1994 3VZE Manual 4x4 X-Cab
31x10.50s 15x8 black Pacer Soft 8's
Pro Comp AAL, Intake
Custom 2.25" exhaust with Magnaflow Cat and Flowmaster Super 40 turndown

mikes19984x4

well, if you say so...i just said that b/c i'm running the same exhaust with a 3.5 inch tip and it's deeper than stock, but i've never set off alarms when revving it out in packed parking lots...and back when i had my 3 12s hitting over 160db, it was not that common to set off alarms with it...

__________________
1998 4Runner SR5 4x4
3.4 w/5-speed & E-Locker
Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
More mods to come...

stormin94

I've set off car alarms before with my 3VZE......of course that was on the way to the muffler shop running nothing but the headers......

O, yeah, I also removed my stock muffler bearings and replaced them with TRD ones. That shut er up pretty nice, too.

__________________

Future Mods
12V Aux outlet-400/800peak inverter
roof basket/lights
Air locker
4.88 gears
H.O. Alternator

mikes19984x4

dude you went with the TRD muffler bearings? i bet that thing is some kind of fast now... but yeah, i could only see a 3VZE or the 5VZE setting off alarms with just headers, and nothing else...

__________________
1998 4Runner SR5 4x4
3.4 w/5-speed & E-Locker
Deckplate & ISR mod w/K&N, 2.5-inch Exhaust w/40-Series Flowmaster
Centerforce Clutch
Bilstien Shocks, 265/75/16 Buckshot Mudders
Sylvania Silverstars, Hella 500s on front bumper (no longer), Orange Gauge Lights, JVC Arsenal Head Unit, Pioneer REV-Series Speakers
More mods to come...

lonestar

I have a 22re, pace setter header, 2.5" a$$, cheapo turbo muff, bore 40 over, k/n intake, no cat(at the time).....
I would set off about 3/4 of the alarms I past
If you like a little exhaust gurgle, go with 2.5, but 2.25 will help keep a solid low end torque for the 3.slow...
choose wisely young grasshopper

__________________
the dude abides

rdlsz24

Does the 22RE also have 2 1/8 as the stock size?

Rob

__________________
1988 Xtra Cab Pickup ('94 22RE; 4x4; 5spd)
Rancho lift w/ 33x12.5x15 tires & 5.29s

X-AWDriver

I've seen .25" increases drop low range horsepower by almost 8whp on natually aspirated engines especially ones that don't have much torque to begin with.
The kid about cried that his $600 catback actually was slowing him down but looks and sound rule what people put on their cars/trucks sometimes.

2.5" on a 3.0 is hurting it down low and if you put it on a dyno you'd see since you're fooling yourself if you feel an increase in power.
2.25" is as big as you'd want to go even on a NA 3.4 3rd gen motor.

__________________
'99 4Runner Highlander 4wd
E-locker,rear diff and deckplate mod * 265/75/16 Nitto TerraGrapplers * Yakima Load Warrior rack * clear corners/signals * Tacoma skidplate * Silverstar lamps/fogs
Alpine CDA-9831,Bazooka EL Series 250w amp,MTX 10" sub

sh0kk86

ive looked at my exhaust, and while its not the stock exhaust, its the same stock size, and looks like its under 2" for sure.

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1986 Toyota 22r Short bed Pickup | 33x10.5x15 BFG MT's

nick