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Select A Muffler

To select a muffler there is a lot of varying factors. Engine size, manifold vs headers, stock vs modified, and the list goes on... Remember every engine is different. Every vehicle is different. Every exhaust is different. Every person hears sounds differently. With all that said this is a base line guide/recommendation for you. Couple things that are HIGHLY RECOMMENDED. To get the best sound from your Porter Mufflers is the exhaust exit… Yes, where/how you exit your exhaust is very important to the quality of sound you get from your vehicle. Porter Mufflers prides itself on “NO DRONE”. Due to our heavy-duty construction of our products, we do not get that annoying drone that some other manufactures have. One thing to help is to exit your exhaust one of 2 ways. First, out the back (straight out or 90 degrees behind rear tires) or at minimum out the side in front of the rear tire. But make sure either way the sound is not exiting and getting trapped under the vehicle. Muffler selection, Big Block and LS style motors are 2.5” to 3” mufflers. Small horsepower V8s (stock 350s) usually 2.25” to 2.5” mufflers. 283ci/straight 6 engines Flathead Fords and lower use 2” to 1.75” mufflers.

Now I know these above RECOMMENDATIONS are based around GM engines. These are only used for examples as far as displacement goes. So please equate your engine as far as cubic inch/liters and above information to make your best-informed decision so may get your ride Porter Equipped. And if you still need assistance just reach out and one of our team members will be happy to help.

Standard Mufflers:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Ceramic-Painted Blue
1.75
3.5
PM35175
Stainless steel
1.75
3.5
SSPM35175
Ceramic-Painted Blue 2.00 3.5 PM35200
Stainless steel 2.00 3.5 SSPM35200
Ceramic-Painted Blue 2.25 4.0 PM40225
Stainless Steel 2.25 4.0 SSPM40225
Ceramic-Painted Blue 2.50 4.0 PM40250
Stainless Steel 2.5 4.0 SSPM40250
Ceramic-Painted Blue 3.0 4.0 PM40300
Stainless Steel 3.0 4.0 SSPM40300

 

Shorty Mufflers:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Ceramic-Painted Blue 2.00 3.5 PM3520014
Stainless Steel
2.00 3.5
SSPM3520014
Ceramic-Painted Blue 2.25 4.0 PM4022514
Stainless Steel 2.25 4.0 SSPM4022514
Ceramic-Painted Blue 2.50 4.0 PM4025014
Stainless Steel 2.50 4.0 SSPM4025014
Ceramic-Painted Blue 3.00 4.0 PM4030014
Stainless Steel 3.00 4.0 SSPM4030014

 

 Shorty Offset Mufflers:

Finish/Color
Offset Degree 
inlet/outlet diameter
body diameter
 
Part Number
Ceramic-Painted Blue
11
2.00
3.5
PM352001411
Stainless steel
11
2.00
3.5
SSPM352001411
Ceramic-Painted Blue 17 2.00 3.5 PM352001417
Stainless steel 17 2.00 3.5 SSPM352001417
Ceramic-Painted Blue 11 2.25 4.0 PM402251411
Stainless Steel 11 2.25 4.0 SSPM402251411
Ceramic-Painted Blue 17 2.25 4.0 PM402251417
Stainless Steel 17 2.25 4.0 SSPM402251417
Ceramic-Painted Blue 11 2.50 4.0 PM402501411
Stainless Steel 11 2.50 4.0 SSPM402501411
Ceramic-Painted Blue 17 2.50 4.0 PM402501417
Stainless-Steel 17 2.50 4.0 SSPM402501417
Ceramic-Painted Blue 11 3.00 4.0 PM403001411
Stainless-Steel 11 3.00 4.0 SSPM403001411
Ceramic-Painted Blue 17 3.00 4.0 PM403001417
Stainless-Steel 17 3.00 4.0 SSPM403001417

 

Truck Mufflers:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Ceramic-Painted Blue 5.00 2.75 PM50275
Ceramic-Painted Blue 5.00 3.00 PM50300
Ceramic-Painted Blue 5.00 3.50 PM50350

 

Race Resonators:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Ceramic-Painted Blue 3.00 4.00 RPM403007
Ceramic-Painted Blue 3.50 5.00 RPM504007
Ceramic-Painted Blue 4.00 6.00 RPM605007

 

Small Core:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Stainless-Steel 4.00 2.50 SSPM4025014SC

 

Motorcycle Mufflers:

Finish/Color
Straight
inlet/outlet diameter
body diameter
 
Part Number
Stainless-Steel 3.50 2.00 MCSSPM35200