The Piercemotorsports Stainless Downpipe with Highflow Catyalytic Converter bolts in to replace the restrictive oem part without modification---a direct replacement part. This part is for offroad/racing use only and not legal on pollution controlled motor vehicles in CA---check your local laws before purchasing and installing.
The highflow downpipe has been dyno tested to increase performance up to 10HP!!! With a good exhaust gains of up to 25HP can be realised as well as increased fuel economy/quicker acceleration, and overall making the Veloster more spirited in every gear!!! The downpipes are built to order, please allow 1-2 weeks for delivery.
The stock converter has 2 cats/beds of element in it fairly close together---the transition from the turbo housing to the first bed is abrubt/has a lip/restriction---not to mention the cell count is much greater than the HF cat---I'm not sure of the number, but I'd imagine it's around 600cel where the highflow cat is 200cel. So the stock oem conv has 2 choke points/which probably have 3 times the cell count---and it's not the smoothest transitions. Our product has one of the best transitions in the biz---Burns knows there stuff and have cars running in every major racing organization (indycar/alms/grand-am/nascar/brief stints in F1 etc...) in the world. The design of the downpipe has been maximised using the knowledge of over 40 yrs of professional engineering in exhaust technologies for motorsports. No expense has been spared and the product is meticulously manufactured using the best processes/materials available. It's literally a work of art!