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Buying exhuast what size?

mtnman210

mtnman210

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I'm ordering some class packs for my balzer. I'm running a caddy 500 with stock manifolds but probably will move to headers down the road. There's no exhaust on it right now.

What size inlet and outlet should I go with.
 
single or true dual?
single i would go with a 3"
dual -i would say 2 1/2" would be plenty
 
i would go with 2 1/2" then, with decent bends in the pipe it will flow more then you will need unless you go crazy on the caddy motor. also if you haven't already; check out CMD cadillac motorsports development and MTS maximum torque specialties, they have a wealth of cad parts and some really great info on those motors.
 
You want 3'' for ~18'' after the collector then go to 2.5'', x-pipe is recomended aswell as mandrel bent tubing.

I would stay away from the glasspacks, loud and can be restrictive. Quality mufflers have a good sound without being obnoxious and will flow as good and some are better than glasspacks.
 
dooo! forgot all about an x or an h-pipe, yes , a very good idea and generally they sound much more balanced with some sort of crossover.
 
Curious but how can a Glasspack be restrictive? You can look straight through any true glasspack.
 
Interesting. Be interested to see some more tests like that of Gibson, Magnaflow, and some of the other more modern products on the market.
 
From another forum:

''
All tests via an independent lab
All tests @ 15” wc

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM


Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM

this may provide some perspective when designing your exhaust setups and choosing muflers. good luck. ''




''I have listed here a muffler shootout test done by CAR CRAFT, they show the best bang for the buck, and show the db's

The Mufflers
MAKE MODEL Part No. COST
SUMMIT Turbo 630125 $14.75
THRUSH Magnum Glasspack 24214 $16.50
THRUSH Boss Turbo 17718 $23.95
HOOKER Competition 21006 $25.95
DYNOMAX Super Turbo 17733 $28.50
DYNOMAX Race Magnum 24215 $31.95
HOOKER Super Competition 21106 $35.95
SUMMIT Fully Welded 630325 $38.69
FLOWTECH Afterburner 50322 $39.95

MUFFLER FLOW TEST

MUFFLER Flow at 28-in H20
DynoMax Race Magnum 528.64 cfm
Thrush Magnum Glasspack 507.40 cfm
Summit Fully Welded 343.38 cfm
Flowtech Afterburner 342.20 cfm
DynoMax Super Turbo 333.94 cfm
Hooker Competition 232.46 cfm
Hooker Super Competition 320.96 cfm
Summit Turbo 331.16 cfm
Thrush Boss Turbo 297.36 cfm

MUFFLER Idle dB WOT dB
DynoMax Super Turbo 89 123
DynoMax Race Magnum 94 133
Flowtech Afterburner 92 124
Hooker Competion 92 122
Hooker Super Competion 90 125
Summit Turbo 89 124
Summit Fully Welded 92 125
Thrush Boss Turbo 90 123
Thrush Magnum Glasspack 92 128
''
 
Any more dB testing? Be interested to see more of the big name stuff like Flowmaster, Gibson, Magnaflow, etc.
 
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'm surprised that you guys say 2-1/2 true duals for a big block motor. I understand the x/h pipe helps alot but I've always thought that for a mild small block you'd want 2-1/4 true duals or a very well bent 3" system and for a hot small block you'd want 2-1/2 with and x or h pipe. As far as a big cube motor went I thought you wanted at least 3in true duals to let the beast breath. Have I been misinformed?
 
Stomis said:
I'm surprised that you guys say 2-1/2 true duals for a big block motor. I understand the x/h pipe helps alot but I've always thought that for a mild small block you'd want 2-1/4 true duals or a very well bent 3" system and for a hot small block you'd want 2-1/2 with and x or h pipe. As far as a big cube motor went I thought you wanted at least 3in true duals to let the beast breath. Have I been misinformed?
Click to expand...

3" is usually overkill for anything but a big block that revs real high. How often do you see Caddy motors turning 5000rpm (and see them live to run again)? A well designed 2-1/2" system won't flow as much as a 3" system, but it will keep the gasses hotter, making them move faster. Plus it's easier to fit a 2-1/2" pipe under the truck.

That being said. The 454 I'm building will be run on a 2-1/4" true dual system. But only because that's whats on the truck now. It will eventually end up with a 2-1/2", x-pipe and low restriction mufflers.
 
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