I'm going to be in the market for a downpipe to move my 2010 WRX to stage 2. I currently have the SPT CBE and like the sound I get from it. My question is, what are the main differences in performance/feel between a catted and catless DP. I'm new to tuning and recently flashed a TP map using tactrix so I'd be getting a TP stage 2 map and flashing right after I figure out what kind of DP I want and get it installed. I'm not looking to spend a ton of money on a DP (if possible) so I'd also like suggestions on some good deals. I live in Iowa and we currently have no emission checks so I wouldn't really have to worry about that (which may be a reason many need a catted DP??). I'm pretty new to this stuff so ignore my ignorance if possible. Also, going to a catless DP, would that throw codes or cause any issues? Thanks!