Join Date: Feb 2008
Location: Wilmington, Nc.. building fantastical shit
honestly, it may be SLIGHTLY lean, but not enough to really worry. its never a bad move to get it dynod and have AFR sampled to determine how far off lambda you actually are. a good shop will pop a hold in the collector and weld an O2 bung there to sniff the exhaust.. a shitty setup to be wary of is a vacuum-based sniffer that goes in the tailpipe..
usually in most cases you won't see a huge deflection in AFR with a slip on and better filter. the changes in air flow can also be perceived by the MAP sensor on the airbox and injector PWM is then automatically compensated, anyway.
if you're really concerned, gather EGTs and see if they're above or below 1380*F.. if they're WAY below, then you need to get AFR corrected for sure.. you can be lean OR rich and be over 1400* as well. EGT in relation to AFR operates on a bellcurve with an exponential rise and fall towards and from the target temp.
overall, you're most probably fine with what ya got.
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Originally Posted by nizzmister
Bike pulls real hard and smooth, kinda like Supra's mom, but without the regret