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 3" Exhaust

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bcreasy

bcreasy

Posts : 84
Join date : 2011-05-14
Location : Indaina

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PostSubject: 3" Exhaust   3" Exhaust Icon_minitimeSun Sep 11, 2011 3:26 pm

Ok Guys I am looking to do a exhaust on my wagon I have a 94 RMW. Does anyone here have experience with a 3" system? Any concerns? I will do the afterburners into a xpipe and then flowmasters and exit after the wheels. I want 3"because I plan on doing a stroker motor I only want to do the exhaust once. if any of you have done 3" and have pics please post them


Thanks Beau
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Deadmanonduty



Posts : 539
Join date : 2011-08-30
Location : Green Bay, WI

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeSun Sep 11, 2011 5:00 pm

If you want flow, and you must if you are doing 3 inch pipe, then do not use Flowmaster mufflers. Its a consensus on most forums that they do not flow well at all.
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Grumpy



Posts : 65
Join date : 2010-08-16

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeSun Sep 11, 2011 7:31 pm

I have a Dynomax muffler on mine. BUT its only a single 3" exhaust. I only have a 6 cyl in it. Sounds nice. Cool
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BigBlackBeaSSt

BigBlackBeaSSt

Posts : 4551
Join date : 2009-08-01
Age : 55
Location : Lewisberry, PA

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeSun Sep 11, 2011 8:50 pm

Dual 3" exhaust will support a LOT of horsepower. Unless you plan on doing 600+ HP it is really unnecessary. You will be hard pressed to fit the exhaust over the axle and around the rear parts. Jerry did it, but he has the ability to fabricate well. I have 2.5" on both of my cars. The tail pipes I will swap to (soon I hope) are 2.5" and taper up to a 3" where you can see them. They also exit behind the rear wheels.
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Guest
Guest



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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeSun Sep 11, 2011 10:11 pm

Probably going to lose some noticeable low end grunt with a dual 3"exhaust system,unless
you have a highly modified engine.It may sound fast but in reality wont be any quicker due
to a slight loss of torque.
JG
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bcreasy

bcreasy

Posts : 84
Join date : 2011-05-14
Location : Indaina

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 7:31 am

So nobody here has done a dual 3" exhaust on a wagon? Other than the you dont need that big or you wont be able to fab it, any one have any help from experience doing the setup before.

I have access to a tig welder and sawsall with a universal pipe kit pretty sure my buddy and I can fab it up. Like I stated I am running exhaust first, then working on the motor looking at doing a 383 with a healthy cam and possibly a bottle.

Thanks for the positive support ;-)

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BigBlackBeaSSt

BigBlackBeaSSt

Posts : 4551
Join date : 2009-08-01
Age : 55
Location : Lewisberry, PA

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 8:10 am

BigBlackBeaSSt wrote:
Dual 3" exhaust will support a LOT of horsepower. Unless you plan on doing 600+ HP it is really unnecessary. You will be hard pressed to fit the exhaust over the axle and around the rear parts. Jerry did it, but he has the ability to fabricate well. I have 2.5" on both of my cars. The tail pipes I will swap to (soon I hope) are 2.5" and taper up to a 3" where you can see them. They also exit behind the rear wheels.

Did you read my post? This is a like to Jerry's newest venture. Go to his cardomain page to see the exhaust well.

http://www.impalassforum.com/vBulletin/showthread.php?t=229065

3" Exhaust 2211190220_medium

3" Exhaust 2211190130_medium

3" Exhaust 2211190441_medium
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bcreasy

bcreasy

Posts : 84
Join date : 2011-05-14
Location : Indaina

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 8:37 am

Thanks Tim I didn't know who Gerry was until the link
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BigBlackBeaSSt

BigBlackBeaSSt

Posts : 4551
Join date : 2009-08-01
Age : 55
Location : Lewisberry, PA

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 9:59 am

Sorry, to much info on the brain!! Shocked

He is in British Columbia. Likely the nicest "stock" wagon in the world (I guess drive-able might be a better term than stock).

But as Jim and I suggested your torque will suffer greatly. You are moving a LOT more air with 3" than 2.5. I did this to a blazer (4.3) and lost ALL my low end. I used pipe adapters and shoved them into the tail pipe to "tune" it.
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phantom 309

phantom 309

Posts : 5833
Join date : 2008-12-28
Age : 111

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 10:48 am

bcreasy wrote:


I have access to a tig welder and sawsall with a universal pipe kit pretty sure my buddy and I can fab it up.


Git 'atter, Wink

don't listen too much to the disinfo about your bottom end torque etc, UNLess you pull off the head pipes and cats. the exhaust is only as efficient as its' smallest bottleneck,.
put a 6" behind the cats, if you want,.worry about "tuning" the exhaust when you have some horsepower, some big cubes, and long tubes,.
There is a very capable technical engineer on this forum who is involved in flow technology,.. perhaps you might ask him,.JaySS. A balance system between the two banks will give it a smoother sound,.

Nick
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mtrhead79

mtrhead79

Posts : 1541
Join date : 2010-04-24
Age : 52
Location : phila. pa

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 6:47 pm

hey tim i just noticed your sig. you finally admitted its a hot rod
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http://mtrhead79@aol.com
BigBlackBeaSSt

BigBlackBeaSSt

Posts : 4551
Join date : 2009-08-01
Age : 55
Location : Lewisberry, PA

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PostSubject: Re: 3" Exhaust   3" Exhaust Icon_minitimeThu Sep 15, 2011 10:13 pm

mtrhead79 wrote:
hey tim i just noticed your sig. you finally admitted its a hot rod

Never said such a thing!!!
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