I just got the latest issue of Dirt Rider with the YZF pipe shootout and I was amazed at how much their results differed from the Dirt Bike shootout. The most glaring example of the disparity between the two is SuperTrapp. If I remember correctly, this pipe was totally panned by Dirt Bike. It sucked everywhere on their dyno tests and their tester didn't like it. But in Dirt Rider it made the highest peak HP numbers out of all the pipes! In contrast the Yosh pipe garnered raves by Dirt Bike and did great on their dyno test but had some of the worst dyno numbers in the Dirt Rider test (but their testers did like it). I think Dirt Rider used the dyno at RPM and I think Dirt Bike used White Brothers? (Sorry, but I am only going from memory, I was going to dig through my stack and find the Dirt Bike issue to compare directly but didn't have time). In summary the Dirt Bike test winners seemed to be Yosh/DSP (Yosh makes the DSP), & GYT-R w/ PC T4 a runner up. In Dirt Rider the winners seemed to be White Bro.s (by far the best dyno numbers for all combo.s) and SuperTrapp. Both tests did note, however, that it was very tough to improve upon the stock header/silencer. I can see how diff. riders on diff. tracks give widely disparate opinions and understand how diff. dynos can give diff. readings but there were a few examples that were diametrically opposed (esp. Yosh and SuperTrapp). I also realize that dyno results are not the panacea for comparing pipes. A dyno run is conducted at WOT right? I don't know about you studs but I don't spend a lot of time with it completely wicked. But what gives? Was SuperTrapp tested in DB a diff. model? How could two separate dyno tests be that different? All these damn pipes are expensive, I bought the PC T4 ($450) in part because I needed the S/A for racing but Dirt Rider's test made me wish I hadn't. I bought the PC after reading the Dirt Bike test, but the Dirt Rider test makes me wish I bought a WB Pro-Meg/E-Series. What other pipes have you guys ridden 426s with and what are your opinions? I do like my PC pipe, midrange feels both smoother and stronger, which is very similar to what their 2-stroke pipes do. I'll compare both tests side by side and check back on Mon., but I wanted to see if you guys had any comments/opinions/insight.