If you have a VW, don't get stuff from NOPI. They aren't as good a supplier for VW tuners as with Japanese import stuff. Check out
www.newdimensions.com www.rapidparts.com and
www.abdracing.com
Techtonics is good name brand for VW aftermarket parts. I got their free flow cat for a Jetta III I had. Unreal. I bought New Dimensions Borla exhaust which was stainless steel (Borla muffler and tip with ND piping, exhaust hangars) and that was worth it's value.
From ABD Racing, I bought their cone intake air filter kit. It was very loud and I ended up putting the stock airbox back on with a K&N filter. I got a headache after 3 minutes of driving. It was like the engine was sitting next to me and all the rocker arms were clinking in my eardrums.