I've had a DNA filter on the work bench for a couple of months,finally fitted and gave it a run,still has the stock filter and Akra pipes with the baffles in,pick up great mid range even better,but even with the smallest run to 90 on the clock,the motor really got it's nickers in a twist,which showed all the signs of running lean,to the point were it all be cut out,and I had to nurse it home till it picked up after some steady riding.

Now I've been around the block figuratively speaking bike wise so fitted my fair share of filters and Power Commanders,but these symtoms seemed pretty extreme to me with just adding a stage 2 filter or is the norm.