Seems like there would be a huge market for upgraded DPF that have higher flow rates yet I haven't been able to find anything online. Maintaining emissions compliance and improving performance seems like the best option to me. Complete DPF deleting may give the best gains but losing my warranty on a brand new truck concerns me. Also i'd think a larger/higher flow DPF would improve the exhaust sound as well. What do you guys think? Why aren't there companies making them? You can buy hi flow catalytic converters but not DPFs.