Im removing a set of Random Tech high flow cats from my gen.4 and putting the OEMS back on.I wasn’t aware that these weren’t necessary to reduce interior heat on the 4 but worked great on my 3.This actually returns my car back to stock.I loved having them on my gen.3 for sound and heat reduction.They will be available next week.Have 2000 miles on them….400 bucks and buyer pays shipping…..PM me if interested.