30ps from using 98ron fuel over 95ron? or is that just an exageration feeling?
As Dave said, chips are not superchips ones, these are written by a proper tuning company who have been around ALONG time.
Currently we have the chips on offer, so they are cheaper than £150.
the spark plugs will do absolutely nothing to improve the car, unless you buy the correct plugs, and are replacing incorrect plugs, but then all you'd be doing would be recovering any loses.
Precious metal spark plugs really only mean that they have a longer service life and can run a closer gap, however the twin electrode vauxhall omega plugs do pretty much the same, as when one electrode wears, the spark will jump to the other.
I wouldnt see the spark leads as a performance upgrade - a preventative measure for failing spark leads or to replace failed spark leads.
the enlarged throttle bodies - we are testing some soon hopefully, and these will be alot cheaper than others i have seen advertised if these proove to work.
HTH