[Onwthn]

I have a 2018 Buick Regal Tourx I have some mods a 72 mm turbo Front mount intercooler with 2.5in piping all the way to the 62 mm Camaro throttle body BNR tuning BNR recirculating valve 3 inch catless downpipe full 3 inch exhaust No muffler no resonator Injecting 70% methanol soon to have stage III cams installed by the 25th hopefully Anyway I have two questions can our intakes be ported and polished or are they fully plastic and if so where can I get that done question 2 anybody make a exhaust header For these cars Any help would be greatly appreciated