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?

 

The downpipe for our cars is pretty restrictive from what I hear.
You may not feel the gains from only a downpipe though. Its a small part to the big picture.

I ordered my downpipe from Cobalt Addiction, should be here in one week.

 

i bought a ZZP/DP combo. Havent installed it yet, but my buddy has the setup and ive never heard this whistle you speak of.

 

Me either, but I have heard of zzp leaking if I recall correctly.

 

i had their mid pipe/downpipe combo a while back and it leaked at the flange, and with this new setup i'm running their catless dp and they have fixed the flange problem cause this one hasn't made a peep.