I’ve run dos botana, techno circuit, proma circuit, proma gp, estoril radical sidebleed, mlm cali and soon to be cranks sidebleed and the estoril is hands down the best all around pipe for stock and mildly kitted e50. I love the lines of the mlm cali and the sound, but I later learned it was made for high reviving polini kits and it’s sucks on an e50 airsal 65, and I mean really sucks. The paint doesn’t last long either and yiu have to grind the flange to get it to fit. If someone made a pipe that looked like the mlm cali or homoet and ran like an estoril id get it in an instant. Maybe the smaller diameter mlm pipes would work better for my build. The sidebleeds look stupid but they work really well for a low 40s bike. The proma circuit is just too ridiculously loud for my taste and it’s feels less torquey than the estoril. I’ve yet to try the proma gp on a kitted bike. I’ll probably clean up one of my mlm calis and sell it.