i just bought some u bends and they have like small metal shavings all on the inside and alot of grease. obviously im not going to run them like this. so i was thinking ill get them fitted and welded but then how shouild i go about cleaning them? shuld i take them to a machining shop and dip them in a heat tank or something.

 

i just tied a rope to a rag a swiped it through with some paint thinner and that got out all the grease and metal shavings. you could also put them in a parts cleaning tank and clean them.

 

brake parts cleaner or throttle body cleaner and spray it throughly inside the pipe.....and run some rags through it to clean that stuff out....

 

good idea. ill try that