Well, I am disappointed. I was really looking forward to having an excuse to re-engineer something much this 4-2-1 Tri-Y design to make something like this affordable to make. We get a lot of requests for a Tri-Y from folks who are convinced it will make more torque...because theory tells them so. I was looking forward to making those customers happy by offering the option. Well, sorry, but it does not make an ounce more torque or hp. And this is a REALLY well designed Tri-Y, I really don't see much room for improvement in it. Thus, overall I can't expect a much better result from a Tri-Y that fits the factory midpipe than what we see here, they did a really nice job on it. I do much like the sound it makes, more heavy purr than the aggressive rip our 4-1 makes. But investing the money to make a more complex header that will end up costing $50 to $100 more just for the nicer sound? Hmm, you guys tell me but my gut says not worth the effort if we can't make any more torque at all?
Thus, my bottom line conclusion so far is that for a bolt in header that works with factory midpipe our RoadsterSport Max Power 4-1 header is still top dog and getting any more torque requires the approach seen in our PPE Long tube (custom midpipe to allow MUCH longer primaries). I have no plans to do anything like our PPE long tube because our friends at PPE already did it, and did a masterful job of it....and the market for such a high end piece that requires a custom midpipe is obviously very limited anyway. For those interested, we have another batch of PPE Long Tubes ready to ship later this week.
Here is the chart, low line is best stock. Then we added our Roadstersport header, midpipe and RoadsterSport 2 exhaust and did three runs resulting in the best for this configuration, which is the BLUE line. As usual, we get over 20 hp to a best of 166 with our RoadsterSport Max Power Header with massive torque gains from idle to redline (that is a fun consistent result since many years ago our very first NC also made 166 max at the wheels with our 4-1 header). Best result with the Tri-Y header is the green line, which tracks our 4-1 almost perfectly from idle to redline with no gains anywhere as compared to our existing 4-1 design.
- Project_Blue_Header-Compare.jpg (125.09 KiB)