RE: hpi baja motor ?
Any good tuned pipe add's loads of power, I run the DDM Dominator pipes on mine and have excellent power and the quality is great on them. I run a 29cc race ported kit with a stuffed stroker crank...unsure why earthsurfer say's they lack top end I seem to have way good top end and loads of torque...it'll wheelie pretty easily
With the DDM Pipe on the stock 23cc it really woke up....I'm sure just the pipe alone will make you happy you'll notice a huge difference from stock thats for sure....it may not wheelie but it'll scream the top end on the 23's really comes alive with a good pipe