I need to fix a cracked flex on my downpipe, I thought about replacing the entire pipe to upgrade the cat and get a mild performance gain. I was going to order a ZZP downpipe but while reading through the reviews, I came across alot of people who all get a whistle when accelerating. Is it worth it to get a whole new downpipe, if so what is a good product...Or just remove the stock pipe and weld in a new flex? Is there really much of a gain with replacing the entire pipe?

 

i just ordered my ottp and recieved it. havent gotten it installed yet but mines catless and the craftsmanship is too notch