RV6 2012+ Civic Si Bellmouth Downpipe

For now, then going with a 3" in the future. Getting the flash pro next
 
You can't compare either dyno. They are two different dynos that clearly have two different smoothing factors as far as showing the increase in hp and tq throughout the entire power band. Look at the stock baseline comparisons between the two. Even though the UR dyno shows a lower tq and hp number below 2700, that part of the graph is useless. Unless the dyno recording was start around 2000rpm or less, you can't really clearly see the power curve at that low of an rpm, nor should you even care. Now you say you shift at 2700 rpm or so for DD, I doubt your flooring it up to 2700rpm, so comparing that power at WOT at that RPM is pointless. The only way to really see if there is a NOTICEABLE difference in the low end power of the two DP is to test both and the same care and see how it feels at partial throttle, which I doubt will even be noticeable with a 11:1 K24. Either DP will show gains, if you have the option of getting catless over catted, then get the catless. Car will make more power, and more than likely cheaper. If you are worried about a cleaner sounding exhaust and afraid the DP catted or catless will cause rasp, don't buy a POS exhaust, invest in a nice exhaust (Full Race) that comes with a well packed resonator and muffler to clean up any rasp that DP might cause. In all my days of dealing with a k series, its honestly hard to make one sound like complete garbage. Some may be really loud but I have never heard one that just sounds BAD.
 
Fed Ex says it should be here Dec. 3! Do I need anything to bolt this up to the factory exhaust or it it 'plug-n-play'?
 
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