View Single Post
      07-29-2013, 03:45 PM   #30
shadow191
Lieutenant Colonel
181
Rep
1,681
Posts

Drives: 2017 Volvo XC90 R-Design
Join Date: Dec 2012
Location: GA

iTrader: (3)

Difference between catless and high flow catted downpipes is 5-8 whp. Difference between OEM and catless is much higher.

Quote:
Originally Posted by jnat View Post
Then why do we all bother is exactly my point! On other platforms, if you look at dyno plots, the difference between the stock pipe and any aftermarket is 35-50 WHP (with tune). On ours, the difference is up to 8 WHP, doesn't that raise a eyebrow or two? My read on that is our stock downpipes are not bottlenecks, they're fairly efficient and flow well. Again, at higher power levels, they're needed but not at DD power levels or what we all refer to as FBO. It's another personal preference. If I saw an incredible difference in dyno plots, I'd do it, but I don't. I'm going to stay away from the 'every tuner recommends' statements because it's not my point. I like to look at the results and again, IMHO the results say that at 350-400 WHP, our stock downpipes especially since we have two work well.
Appreciate 0