4". for me
But whatever size fits before becoming a pita to install
I'm all for the best flow with the minimal amount of fabricating but wouldn't want to de-rail other's chance to make some serious power. If you go with
MGeyer 09-19-2023, 09:41 PMYes, our new swingvalve design is similar to the straight out ATP version. We have made a few improvements from our previous design.
I sent an email to OTC to find out if the 4000E modifies it's display of information coming from the ecm. The following is a copy of the body of that
jeff1234 09-19-2023, 09:28 AM
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Re: New And Improved Swingvalve on the Drawing Board
The advantages of a 4 inch exhaust outlet are mainly close to the turbo. Once cooled, the exhaust volume decreases and benefits would decline. For this
Chris W 09-20-2023, 05:36 PM