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Weak low-down torque from a '99 3.4

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This summer, I swapped a '99 996 3.4L into my '98 Boxster. I really love the conversion, but it definitely seems to be down on torque below about 4K RPM. Not having driven a 3.4 996, I don't know if this is normal or not.

The engine was programmed to RoW specs with the idea of using catless headers, catless mid-pipes, and an aftermarket exhaust, but because of fitment issues, it currently has catless headers, Boxster S cats, and an aftermarket exhaust. It has a Cayman airbox and filter. Does the computer need to be re-programmed for this setup? What else can be done?

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Do you have Durametric Diagnostic software if so take a look at the cam timing. You can also check other possible causes with this software.

I have cats in the mid-pipes, not in the headers. No error codes, just doesn't seem like it has as much torque as it should.

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