hey,
i have also been reading about excessive backfiring,
i have a relative standard r33 series 2
Pod filter + air box
Split dump with 3inch exhaust
9psi boost
FMIC
Standard BOV
I have changed sparkplugs 2 BCPR7ES i always run Caltex Vortex 98. My car only backfires on decel, when the outside temp is hot, i no this sounds weird and crazy but my car will only backfire when it is extremely hot day or i have it on a track.
If anyone has any ideas it would be appricated thanx