Originally Posted By: MCompact
I ran a Mazdaspeed-a re-badged AEM-cold air intake with a Dryflow filter element on my 2007 MS3 for over 115,000 miles. According to Mazda it added @25 hp; in my testing it chopped 0.60 seconds off the 30-70 mph times in third gear. Here's what Blackstone Labs had to say about the last UOA before I traded it for the 2er(at 153,000 miles with a 7,100 OCI on 5W-30 M1 EP):
Here's another great one! Really, our only complaint about your Mazdaspeed 3 is that we never
have anything to discuss, since its received eleventy-billion excellent reports, and you've heard everything
there is to say about this venerable engine. Wear remains steady as a rock once again, and metals are all
well balanced and at appropriate levels for your interval. There's no contamination to speak of, air and oil
filtration still look good, and the TBN was nice and strong at 4.7. As usual, our suggestion for you is - don't
change a thing! You're obviously doing a great job.
UOA doesn't detect all particle sizes. How do you know that the filter wasn't letting through something that Blackstone isn't testing for and/or can't detect?
I'm not saying they're wrong, but you should be looking at the UOA results with the right lens.