Ive had headers for over a year. No smell at all that ive noticed. Theres only a minimal sound increase. Zero cabin drone. Cops wont notice.
p.s. My exhaust is stock besides headers
Sent from my ADR6350 using Bimmer App
2004 325i sedan
3 pedals, ZSP, ZPP | bimmerbrakes headers | shark injector | AFE filter / swiss cheese | 17" TRMotorsports C2 | H&R suspension | CF sunroof delete | custom short shifter | clear lights | CDV delete | DIY aux audio in | lots of random $5 mods