Here is a new in box Rossi R90 rear exhaust powerhouse. This R90 is a scaled up R61 short stroke engine. It makes about 4hp at 15,000rpm according to some old blogs. As for the pipe, it was indicated on RC Groups as a Rossi tuned pipe (maybe for a ducted fan too?) so I am selling it with this Rossi R90 as a tuned pipe that should work with the correct length of silicone connector for your propeller size. I will include a fitted silicone connector with several clamps (see last pictures). The tuned pipe is new and really a high-quality piece of metal meant for big RC engines - these larger pipes are costly in today's market selling for $150-$200 by themselves. What you see is what you get and shipping and insurance as it will be shipped in 1 oversized box or 2 boxes (1 long tube and 1 box). They will be shipped using USPS Ground Advantage with eBay's new insurance which is about $10.