[Jeff_in_Oviedo]

Originally Posted by nsquared

Never had a catless dp so I wouldn't know either.

I used to have a catless dp on my 2002 WRX, and it smelled a little like cat urine. It has been many years now so I can't remember the smell as if I had just smelled it, but do remember how i would describe it. After being cat-less for a few years, I switched over to a catted downpipe, made by Helix. I didn't notice any drop in power, and the smell went away. If you have the money to spend, I would recommend getting the HFC version, you most likely won't notice a significant power difference. I believe somewhere on here the difference is quoted as around 5 hp. When you are putting down 300-400whp, 5 hp here or there isn't really a huge deal, in my opinion.