@Tyrefitter
SNAP … I upgraded to MSD Mulitmaps yesterday (Saturday) too from FPM375!! Same power map and got the step colder spark plugs to compliment.
And WHAT a difference the MSD is over the FPM375!!! The car is alive!!!!
Still not sure if 420 needed especially as the Sports Cat is needed to achieve and it’s more cash and hassle to get fitted!
Thanks to Stu and staff for help and super quick delivery to Northern Ireland!! Cheers.
2017.5 RS MG MSD Multimap 350/380/420
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This reply was modified 3 years, 7 months ago by nitemare.