Originally Posted by m3an
if you just add another set of resonators it will just deepen the tone. The above HKS setup is Heimholtz chambers. The key is running them like 90 deg off the pipe. You don't even need the full bottle type resonator, a length of 2.5" pipe welded off the side and capped on the end will work just as well.
Hm, I may have to try this. I just ordered a set of Aero AR25 resonators that were 75 bucks shipped from EBAY (cheapest price was 36 each), and I figured if I could replace the OEM ones, It would be worth a shot. Maybe I can reuse the oem ones to make the chambers. I will have to find time to work with my mechanic to discuss this. With the Heimholtz chamber set up, is that possible to do with my mufflers? I know theres a lot of room between the top of the mufflers to the bottom of the trunk.
2008 (07/08) E92 M3 BPM Stage II Tuned by Mike Benvo, 6MT, Turner Test Pipes, Magnaflow Custom Catback Exhaust (Magnaflow X Pipe, secondary cat delete, Aero Resonators and Helmholtz Chambers),Vorsteiner CF Lip, Hamann Style CF rear diffuser, CF Rear Decklid Spoiler, BMW Performance Kidney Grills, CF Side Grills, OEM GTS Wheels, K&N Drop-In Filter, GP Thunder 8k Angel Eyes, Painted Reflectors.