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Rick,
as you know I have your 3.10 pulley and your street chip tuned for CA gas etc. I recently emailed you my dyno chart which showed my A/F curve to be starting out at 15 and flattening out to a nice 11.4 at the top end. I have just installed a Bassani X-pipe (cat-back already installed) and also plan to put on a throttlebody and my question is this:

How will those mods effect the A/F ratio?
Will it be necessary/critical to have a retune on the chip for safety reasons (too lean) or should I get a retune done to take advantage of the new additions for more HP & TQ?

Thank you

Brett
 

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As long as it has cats you'll be fine. I found the basanni catted x on some cars will be .1 leaner. There offroad 3 sometimes 4 tenths leaner.

Rick
 
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