Re: TOY: Exhaust suggestions?

[Mike Piechowski <lil_mike@xxxxxxxxxxxxx>]

Chuck wrote:

> Mike,
>
> The headers are already installed, so it is just a question of getting 
> the cat-back. I am pretty confident about the muffler model/size what 
> I'm concerned with is losing too much back pressure because the pipe 
> diameter is too large.
>
> Mike Piechowski wrote:
>
>> Chuck wrote:
>>
>>> Hey guys, I'm looking to add a cat-back exhaust system to my '95 
>>> 4Runner(3.0L V6) and I'm wondering what you all would recommend for 
>>> a pipe diameter. I'm using Downey's headers back to the factory 
>>> catalytic converter. I was thinking of using 2.5" pipe with a 
>>> flowmaster 50 muffler. Any thoughts?
>>> 4x4Wire.com Toyota Section http://www.4x4Wire.com/toyota/
>>>
>> I've got the NWOR header and 2.5" (I think) catback with a Flowmaster 
>> 70 SUV (Very Big Muffler) on my 92 4-cylinder - it is pretty loud, 
>> but definitely picked up some pep in the higher rpm's
>>
>> The Flowmasters are designed for engine size  - or so their website 
>> says. The one I bought is WAY TOO BIG for my little 4-banger, and 
>> does not muffle as well at WOT as the right sized one should. The 
>> local Hotrod shop was just happy for the sale, but really could not 
>> make recommendations because I only have 4 sparkplugs. The 50 is 
>> smaller than mine, so it should fit better. Not sure which flowmaster 
>> to recommend with a V-6, maybe check Flowmaster's website. By the way 
>> - Flowmaster makes a tough muffler, should hold up for years.
>>
>> NWOR's catback came with a muffler, and went on without a problem. 
>> Nicely made, fully mandrel bent, used all the factory hangers. I did 
>> the install in my uncle's driveway in the dark with only hand tools - 
>> still only took me a couple of hours. Other than a little mishap with 
>> the master cylinder reservior (knocked it off fitting the header), 
>> everything went together well. Can't say a thing about Downey 
>> exhausts, never used one.
>>
>> It will definitely make more noise than it used to - be ready.
>>
>> 4x4Wire.com Toyota Section http://www.4x4Wire.com/toyota/
>>
>
>
> 4x4Wire.com Toyota Section http://www.4x4Wire.com/toyota/
>
What do you use the truck for? I gladly traded the slight loss (if any) 
in the really low end off idle for what I picked up from 3000 rpm up. I 
don't think you'll experience any real low end losses with the 2.5 inch 
cat-back because you're planning on keeping the cat, so that restriction 
remains in place. Emission levels might rise a touch, but you should 
still pass the sniffer if required.

Does your truck have the same door-type MAF as mine? If so, you might 
want to richen things up a few teeth now that you have a full exhaust in 
place. Toyota's tend to run lean, reportedly this worsens with a lower 
restriction exhaust. There are instructions on the web - I can find you 
a link if you need one.

OH - here's a tip - Fel-Pro makes a Dodge exhaust gasket with a metal 
reinforcement that is an exact fit for the Toyota Cat flange on the 
4-cyl (and maybe the V-6) - so take your flange to your favorite parts 
shop and find good gaskets. The gaskets only cost a couple of bucks and 
last a lot longer. Be sure your Cat goes back in the right way (there is 
an arrow on it) Mine still passed emissions, but just barely....

Mufflers and gaskets have been my biggest points of failure. First 
muffler was my fault - crushed it on a stump....the second developed 
fatugue cracks in the inlet and outlet tubes. Neither of these were 
Flowmasters. I typically have to replace the cat gaskets every two to 
three years. The header gasket has only blown once, but the last time I 
replaced the header gasket, I resurfaced the header flange and 
re-studded the head (I've got about 90,000 miles on the header and 
catback, only about 40,000 on the flowmaster). Using all new grade 5 
bolts with anti-seize is definitely a requirement if you hope to ever 
take it apart without a sawzall or torch. Once I got the fit right on 
mine (no rattles, pipes in the right place) I welded all of the joints 
after the cat, but this really isn't needed.

Mike


From owner-toyota@www.4x4wire.com Sun May 23 12:13:23 2004
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Date: Sun, 23 May 2004 10:04:42 -0700 (PDT)
From: "K. Fong" <kenfong@pacbell.net>
Subject: Re: TOY: Exhaust suggestions?
To: toyota@4x4Wire.com
Cc: cgreco@dedot.com
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I have Downey headers w/ a custom crossover (2.25"
from each header) into an aftermarket cat (2.5") to a
Dynomax Ultraflo Welded Muffler (2.5") and 2.5" pipe
all the way back.

The Ultraflo creates less backpressure than the
Flowmaster.  That will be fine.


--- Chuck <cgreco@dedot.com> wrote:
> Hey guys, I'm looking to add a cat-back exhaust
> system to my '95 
> 4Runner(3.0L V6) and I'm wondering what you all
> would recommend for a 
> pipe diameter. I'm using Downey's headers back to
> the factory 
> catalytic converter. I was thinking of using 2.5"
> pipe with a 
> flowmaster 50 muffler. Any thoughts?
> 4x4Wire.com Toyota Section
http://www.4x4Wire.com/toyota/