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Old 05-05-2008, 06:12 PM   #1
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Default exhaust vs performance

i just left the exhaust shop and well bad new my converter is no good so im gonna up grade my exhaust any tips!
what i have stock bonne down pips, slp hi flo converter, back to 2 40 series flo masters w/ 2.5 outlets

what i about was, 3in down pipe no converter, 3in all the way back to a single flowmaster with 3 in inlet and dual 2.5 outlet
this will cost $240
any tips
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Old 05-05-2008, 06:29 PM   #2
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Default Re: exhaust vs performance

Quote:
Originally Posted by SPEED ADICTIONS
i just left the exhaust shop and well bad new my converter is no good so im gonna up grade my exhaust any tips!
what i have stock bonne down pips, slp hi flo converter, back to 2 40 series flo masters w/ 2.5 outlets

what i about was, 3in down pipe no converter, 3in all the way back to a single flowmaster with 3 in inlet and dual 2.5 outlet
this will cost $240
any tips
The proper size for a high flow cat on a 2000+ is 3" with a 2.5" to 3" reduction on the muffler end and a 2.75" to 3" custom reduction from the downpipe section. A high flow cat will run you about $50 on ebay, your oem cat is worth roughly $120-$150. I just sold mine for $140......

If you are upgrading the whole exhaust to 3", forget the reduction pieces since your pacesetter headers already have the 3" output on them.

Muffler wise you may want to add a LARGE resonator to lower the exhaust tone a bit if you chose to go with aftermarket mufflers. Most sound similar, Magnaflow, Hooker, or Flowmaster are all good options.

You may also want to read this or pickup this since your post does not make that much sense to me.
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Old 05-05-2008, 06:29 PM   #3
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You are not out flowing the stock 2.5".
"Upgrading to 3" is IMHO a waste of money for no measurable gain.
Keep the Cat; if your new one is bad try to get it replaced under warranty. You will not se any gains going from a high flow cat to a straight pipe and, you avoid the legal issues.
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Old 05-05-2008, 06:45 PM   #4
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Go with a Hogan 3" down pipe
http://www.hoganperformance.com/index.htm

3" pipe back to the "Y" then twin 2 1/2" mufflers, you want the muffler to flow like an open pipe but keep your car as quiet as possible.
Here is some good information to base muffler choice on! Excellent site to hear muffler sounds.

http://ls1sounds.com/

Which muffler flows the best?
Supposedly this review was performed by Martel Brothers:

All tests via an independent lab
All tests @ 15 wc

2 Straight Pipe 283 CFM
2 Straight Pipe 365 CFM
2 Straight Pipe 521 CFM

2 Typical Bent tailpipe 268 CFM
2 Typical Bent Tailpipe 417 CFM

2 Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 Cherry Bomb 239 CFM
2 Cherry Bomb 294 CFM

2 Inlet/Outlet Dynomax Super Turbo 278 CFM
2 Inlet/Outlet Ultraflow Bullet 512 CFM
2 Inlet/Outlet Gibson Superflow 267 CFM
2 Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 Inlet/Outlet Thrush CVX 260 CFM
2 Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 Inlet/Outlet Hooker Aero Chamber 324 CFM
2 Inlet/Outlet Hooker Max Flow 521 CFM
2 Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM

Standard OEM 2 Inlet/Outlet 138-152 CFM
Standard OEM 2 Inlet/Outlet 161-197 CFM

The mandrel bending of the pipes done by aftermarket exhaust companies is good for 2-4 hp depending on the severity of the stock bends. Most local exhaust places don't have a mandrel bender so changing the pipes out doesn't do anything if pipe size it not increased.

My opinion, if its more noise and a little more power just add the best flowing stainless muffler to the current system and never do it again. If you increase pipe sizes, then a local shop and only stainless. Don't care about money but want ease and better gains than most local shops can offer with no pipe size increase, and aftermarket exhaust.

NOISE does NOT equal POWER!!!

Which muffler is quietest but makes the most power?
This test was performed by 5.0 Mustang & Super Fords Magazine, December 2002 issue (page 55) on a '90 Mustang LX coupe with 370hp and 11 second potential. 66 pulls were made for this comparison:

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):
1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

I have twin 3" Hooker Aero Chamber mufflers on my car and it sounds damm good.
If i had to buy new mufflers i would get twin 3" Hooker Maxflow mufflers.
If you have a lot of exhaust dorne in the car then i would put the Moroso spiral muffler on where the old resonator was, as it got rid of most if not all of the drone i had.

ROD
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Old 05-05-2008, 07:23 PM   #5
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Quote:
Originally Posted by rrounds
Go with a Hogan 3" down pipe
http://www.hoganperformance.com/index.htm
He does not need this since he has pacesetters.
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Old 05-05-2008, 07:29 PM   #6
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I was wondering ,roughly, the same thing.. How do you have stock downpipes and headers?
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Old 05-05-2008, 10:43 PM   #7
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opse sorry bout the down pipe deal im comin off the down pipe from the headers im sorry guys i made a oopse!
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Old 05-05-2008, 10:44 PM   #8
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Please re-word that so we can understand it.
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Old 05-05-2008, 10:50 PM   #9
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The downpipe section is 3 inch and at the end there is a slip fit connection that tapers to 2.5" with a flange. now from that what is the best way to go stay 2.5 all the way back or open it up to 3", i understand more nosie doesnt equal power, i just wont to know how to make more power out of my exhaust
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Old 05-05-2008, 10:56 PM   #10
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You're not flowing enough to gain power by opening the exhaust. If you open it up too much (3") you'll kill your low-end torque.

Until you hit the 13'* on the quarter mile, keep the 2.5" exhaust. Actually, make that until you hit 13.5 or better.

Please take a pic of your header/downpipe connection for us.
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