Their reply makes sense. I mean the VVEL allows for perfect and continuously variable cam timing all throughout the powerband so "cracking" it would be useless. If the LTH's are not allowing backpressure to be produced then I wouldn't really blame F.I or GTM for this issue. I'm willing to bet Stillen will run into the same issue if they attempt to tune their kit with LTH's and CBE pre-installed.
Maybe some catted LTH's would allow for some backpressure build up and thus retain pressure in the chamber? I guess someone will need to test this out and see if any gains are made versus stock headers and test pipes combo.
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