There seem to be many downpipes out there from all sorts of different manufacturers. They seem to have different designs, but all seem to be made from 304 Stainless.

Is one design better than the other?
Is there a brand out there that will interfere with the O2 sensors that should be avoided?
What are your experiences?
What would you recommend based on your experience?

 

if you chose one of the following you'll be fine.... AMS, MAP, ETS. but also know there is downpipes that reuse the oem o2 housing and then those that replace o2 housing and dp. Rexpeed makes one but dont think long lasting quality is that great.

 

ams has a great design, fully cast bellmouth design, no other company offers that, turbo xs has a cast bellmouth section but poor construction, everyone else uses stainless tubing. everything on my car is ETS, except the downpipe which is ETS. to me it's the best designed and highest quality downpipe out there. the downpipe sees alot of heat, so with the heat cycling i think the ams cast design will hold up better than a divorced tubing design, i haven't heard of a failure with ETS though, i came from subarus and the cobb cast design was the best and the ams is very similar. bottom line go with what you like i don't think you can go wrong with AMS or ETS

 

what kind of pricing have u been seeing ?

 

This.

 

AMS

/thread

 

I would go with the AMS.