I found a cheap HKS downpipe... but I want to do some AMS stage kits (Such as stage 1, 2, etc). I'm all about saving money and I found a really cheap HKS downpipe. If I installed this and some AMS components as well, would it affect anything? Sorry, I'm kinda new to all this tuning stuff...

 

the hks downpipe is only 2.5" or 2.75" in diameter. I recommend a 3" downpipe.

 

It is 70mm or 2.7559055 inches and should be good for whatever a stock turbo can throw at it. HKS is good quality, I don't see how you can lose.

 

You probably found my HKS Downpipe for sale huh? Anyway it is just a tad bigger then 2.75" and it is version 2 without the flex in it. But you are right you cant beat the quality of HKS.