QR Code Link to This Post The header and midpipe were built exclusively for Mike Alessi's 2015 Honda CRF450 SX bike with the Motoconcepts Racing Team. When I spoke to Toni Alessi, when I purchased the header/midpipe, he mentioned it didn't lay down what they wanted on the dyno for their bikes. I never installed it, but went with a full titanium exhaust they used in the SX season instead. The header/midpipe are in great condition. I just went with a different setup. $250 obo.