You have to find a pipe that match with your engine as well. that's is important. Arrow GTR is really smooth engine I used mine with OS 2060 pipe, however my case cracked at near the end of gallon number 4...... otherwise the Arrow is a nice mill for the price. So I just picked up an OS instead, and it's been running great so far
but seriously you pay for what you get. Also pull start engine won't rev as high as the bump start engine.