Exhaust Diameter

[Prodigal]

Adding Kooks 1.75” to 3” collector LTH. 3” mids with green cats. Do I need or should I use a 3” H pipe and 3” axle backs? If the entire system isn’t the larger diameter what difference does it make how much of it is? Only one 3” H pipe I am aware of, Corsa. Want to keep my AE capability. NA car for now.

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[GregO]

Adding Kooks 1.75” to 3” collector LTH. 3” mids with green cats. Do I need or should I use a 3” H pipe and 3” axle backs? If the entire system isn’t the larger diameter what difference does it make how much of it is? Only one 3” H pipe I am aware of, Corsa. Want to keep my AE capability. NA car for now.

Off the cuff I believe your Mach1 system is 2.75" but I'm not 100% sure. You could measure your stock tube size to verify.
Figure out the OEM size and post back.

 

[K4fxd]

1.75 is on the small side for a coyote. Most like the 1.875 Especially if you might add power later.

 

[GregO]

1.75 is on the small side for a coyote. Most like the 1.875 Especially if you might add power later.

To my surprise the OEM Coyote, VooDoo and Predator 4-2-1 header primaries are 44mm or about 1.73" diameter.

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