I broke my knock sensor when I was taking my intake off my 1997 ex. the parts store wants $110 for one but i cant afford that so I got to looking on ebay and found one on there for $11.75 brand new with a 1 year warranty. I was wondering if any of yall have ever bought anything off of autopartpro. he has a 99% feed back but still unsure of him mainly because of how cheap it is.