| At best you'll spend more time dialing in your TPS values,playing with your idle adjust a bit, and last but not least, cursing the heavens because they are not balanced out the box, quite a bit of back and forth getting both butterflies dialed in closely with a feeler gauge to open and close identically..   They are installed on my Z and boy oh boy did I have fun grinding away at these hookers to make em work correctly..  My afr's stayed the same essentially throughout the rpm range, now if someone throws on full 2.5" intake piping, this is where the larger volume of air moving into the motor tends to lean out your afr's a bit, as I have seen on multiple sets after the install.  Nothing crazy lean to blow your motor out the gate from my experience. What I have seen: Before idle: 14.7 After 2.5" install: 14.9 WOT before: 12.1 After install: 12.7 Blah blah, you get the gist, nothing a few minutes of street tuning can't fix after a 2.5" piping install. 
~Mario D.   --------->
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 BIG single VG underway, stay tuned for the Massacre....
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 Nice, it's all fun and games until the turbos kick in :) (n/m) - Chickan  14:13:32 02/03/12 -God forgive him, he does not know what he is saying.. (n/m) - CmyZ 22:37:30 04/26/12 -I've learned its never over. (n/m) - Drk93TT 15:53:51 04/27/12 (6) --------------------------------------------------------------------
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