Hey everyone I just picked up a Subaru Legacy Blitzen not too long ago. The previous owner had a second exhaust that is a straight pipe from the downpipes back I ended up installing in but after a month or so the car spews black crap out the exhaust on start and some black smoke when driving especially when the second turbo hits. I assume I am just running rich and have a tune booked already to help but could this be from the exhaust or would something else be causing this
Thanks
Thanks