has anyone made or have heard of anyone with making custom downpipes? It should not be too hard just wanted some peoples input on it. 1500 is steep for the price of downpipes when you can get 2 high flow cats for under 200 and the pipe for less than 100 or so. Just wanted to know if
1- any problems with the o2 sensors failing
2- problems with fittment.

thanks for the help